问题补充:
— It be Mr.Johnson who is in the office.
— No, it be him.I saw him off at the airport half an hour ago.
A. can’t ; can’t
B. must; can’t
C. must; mustn’t
D. may; mustn’t
答案:
A. can’t ; can’t
(答案→)B. must; can’t
C. must; mustn’t
D. may; mustn’t
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