问题
选择题
Hurry up! They ________ for us at the crossing.[ ]
A. must wait
B. must have waited
C. must be waiting
D. may wait
答案
答案：C
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Hurry up! They ________ for us at the crossing.[ ]
A. must wait
B. must have waited
C. must be waiting
D. may wait
答案：C