问题
选择题
— Why isn't Cathy here yet?
— She _____ to be picked up at the station. [ ]
A. could wait
B. must wait
C. might be waiting
D. can be waiting
答案
答案：C
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— Why isn't Cathy here yet?
— She _____ to be picked up at the station. [ ]
A. could wait
B. must wait
C. might be waiting
D. can be waiting
答案：C