单项选择题

Old people ______ carefully.

A. must be listened
B. must be listened to
C. must listen to
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单项选择题
Jack called from Canada as______as he arrived there.
[A] soon
B. quickly
C. possibly
单项选择题
Things will turn bad if we ______ there on time.
A. not get
B. don’t get
C. won’t get
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