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How ________ you say that you really understand the whole story if you have covered only a part of the article?

A.can B.must 
C.need D.may 

A

解析can在疑问句中,表示疑惑、怀疑,可译作“可以”。答案B和C意义不通,答案D的may,不能用于may you…?

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