---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 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。