摘要： --- 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.

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--- 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

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--- 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.

--- 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

查看习题详情和答案>>

--- 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.

--- 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.

--- 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.

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--- 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.