The rescue team must have searched for the missing visitors two days ago, _____?
A. mustn’t they
B. haven’t they
C. didn’t they
D. hadn’t they
A. mustn’t they
B. haven’t they
C. didn’t they
D. hadn’t they
【答案】
A. mustn’t they
B. haven’t they
C. didn’t they
D. hadn’t they
A. mustn’t they
B. haven’t they
C. didn’t they
D. hadn’t they
【答案】
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