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---Listen!Davidistalkinghappilywithhismotherinthenextro...

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问题详情:

---Listen!Davidistalkinghappilywithhismotherinthenextro...

--- Listen! David is talking happily with his mother in the next room.

--- It ______ be his mother. She has gone to Yunnan to be a volunteer doctor.

A. should                 B. must                       C. can’t                      D. mustn’t.

【回答】

C

知识点:情态动词

题型:选择题

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