I'm tired out. I all afternoon and I don't seem to have finished anything.A. shoppedB. have shoppedC. had shoppedD. have been shopping

题目

I'm tired out. I all afternoon and I don't seem to have finished anything.

A. shopped

B. have shopped

C. had shopped

D. have been shopping

相似考题

1.I’ve brought two babies with me. It’s really inconvenient for me to drive to the underground parking lot.A.Don’t worry. I’ll take care of your babies while you’re driving to the underground parking lot.B.Don’t worry. Someone will drive to the underground parking lot for you with little chargeC.I’m sorry. There is no vacancy right nowD.Don’t bother about it. We provide free valet service

2.—I'd met Smith several times before.—So (have) ( ) I.

3.–– Host: Jack, come and sit in the sofa. Dinner will be ready in a minute. Could I get you something to drink?–– Guest: ____.A: No, don ’t trouble. I ’ve drunk enoughB: No, you couldn't. I'm not thirstyC: Yes, you could. I ’d like some Coca colaD: Yes, please. I'd like some Sprite

4.Don’t write in the third person but don’t () “I”.A.useB.overuseC.writeD.put

更多“I'm tired out. I all afternoon and I don't seem to have finished anything.A. shopped ”相关问题

  • 第1题：

    按行优先顺序存储下三角矩阵的非零元素，则计算非零元素a/sub>ij1≤j≤i≤n)的地址的公式为

    A．LOC(aij)=LOC(all)+i×(i+1)/2+j

    B．LOC(aij)=LOC(all)+i×(i+1)/2+(j-1)

    C．LOC(aij)=LOC(all)+i×(i-1)/2+j

    D．LOC(aij)=LOC(all)+i×(i-1)/2+(j-1)


    正确答案：D
    解析：通过运算可以得出结论选项D)正确。

  • 第2题：

    下列程序段的时间复杂度为()。for(i=0；i＜m；i++)for(j=0；j＜t；j++)e[i][j]=0；for(i=0；i＜m；i++)for(j=0；j＜t；j++)for(k=0；k＜n；k++)c[i][j]_c[i][j]+a[i][k]×b[k][j]；

    A.O(m×n×t)
    B.O(m+n+t)
    C.O(m×t+n)
    D.O(m+n×t)

    答案：A
    解析：
    在程序段中，有两段循环程序，第一段是一个双层嵌套循环，另一个是三层嵌套循环，所以基本操作是c[i][j]=c[i][j]+a[i][k]×b[k][j]，此基本操作共执行m×t×n次。

  • 第3题：

    下列程序段的时间复杂度为（）。 for（i=0； i for（j=0； j c[i][j]=0； for（i=0； i for（j=0； j for（k=0； k c[i][j]=c[i][j]+a[i][k]*b[k][j]；

    A．O(m*n*t)

    B．O(m+n+t)

    C．O(m+n*t)

    D．O(m*t+n)


    C

  • 第4题：

    -- Ann is in hospital.

    -- Oh, really? I __ know. I __ go and visit her.

    A. didn’t; am going to B. don’t; would

    C. don’t; will D. didn't; will


    正确答案：D

  • 第5题：

    下列程序段的时间复杂度是（）。 for（i=0; i＜m; i++) for（j=0; j＜t; j++) c[i][j]=0; for（i=0; i＜m; i++) for（j=0; j＜t; j++) for（k=0; k＜n; k++) c[i][j]=c[i][j]+a[i][k]*b[k][j];

    A．O(m+n+t)

    B．O(m+n*t)

    C．O(m*t+n)

    D．O(m*n*t)


    O(n^2)

  • 第6题：

    下列程序段的时间复杂度是（）。 for（i=0;i＜n;i++) for（j=0;j＜m;j++) for（k=0;k＜t;k++) c[i][j]=c[i][j]+a[i][k]*b[k][j];

    A．O(m+n+t)

    B．O(m*n*t)

    C．O(m+n*t)

    D．O(m*t+n)


    C

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