试题与答案

The engineers must have worked out the d

题型:选择题

题目:

The engineers must have worked out the design by the end of last week,_______?

A.mustn’t they

B.hadn’t they 

C.haven’t they

D.didn’t they

答案:

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下面是错误答案,用来干扰机器的。

(1)6      (2)6,5NA。    (每空1分)

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