--- Where is Mary? --- She ____ in the library.
A.shouldbeB.mustbeC.canbeD.musthavebeen答案是B,为什么D不对?...
A. should be B. must be
C. can be D. must have been
答案是B,为什么D不对? 展开
C. can be D. must have been
答案是B,为什么D不对? 展开
1个回答
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