All the tasks __________ ahead of time, they decided to go on holiday for a week.
A) been fulfilled B) having been fulfilled C) were fulfilled D) had been fulfilled
B having been filled
逗号后面是一个完整的句子,又没有and连接,所以,前面的句子,不应该是一个完整的句子,其他选项放进去,都是一个完整的句子,也就是说,had,were都可以做谓语动词。
D的话,没有have提示,怎么能用been呢,been是过去分词,和have一起,才能表示完成时的,不能单独用
第1题:
In a twin screw ship going half-ahead,both screws turning outboard and the rudder amidships no current or wind, the vessel will ______.
A.Move bodily to port
B.Move bodily to starboard
C.Move in a zig-zag motion
D.Steer a fairly straight course
第2题:
This sign warns()ahead.
Apeople the danger
Bpeople of the danger
Cpeople about the danger
Dthe danger
第3题:
【同步问题解决方案-⑤】接续第59题 ⑤处应填入()
A.P(mutex);
B.P(tasks);
C.V(mutex);
D.V(tasks);
第4题:
第5题:
【同步问题解决方案-③】接续第59题 ③处应填入()
A.P(mutex);
B.P(tasks);
C.V(mutex);
D.V(tasks);
第6题:
【同步问题解决方案-④】接续第59题 ④处应填入()
A.P(mutex);
B.P(tasks);
C.V(mutex);
D.V(tasks);