— Where is John? — He in the library.A. should be B. must beC. can be D. must have been

发布时间：2020-08-17 12:22:56

— Where is John?   — He      in the library.
A. should be
B. must be
C. can be
D. must have been

网友回答

A. should be
(答案→)B. must be
C. can be
D. must have been
解析： must do表示对现在的事实进行推测。
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