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---The man in charge knew nothing about the design and all his assistants had ne

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---The man in charge knew nothing about the design and all his assistants had ne

---The man in charge knew nothing about the design and all his assistants had never done any designing work before .

---Oh, I'm afraid it ______ a success.

A.mustn't be

B.mustn't have been

C.couldn't be

D.couldn't have been

试题答案

D

此题系小语篇,上文决定下文的措辞。