单项选择题

Hurry up. My mother ______ for us in the zoo.

A. must wait
B. should be waiting
C. must be waiting
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单项选择题
He ______ while I was studying.
[A] played
B. plays
C. was playing
单项选择题
There’s no flight to Shanghai tomorrow, so I’II go by train
[A] either
B. yet
C. instead
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