单项选择题

We ______ the office where our beloved Premier Zhou once worked.

A. called on
B. called at
C. called in
D. called back
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单项选择题
People try to avoid public transportation delays by using their own cars, and this ______ creates further problems.
A. in short
B. in case
C. in doubt
D. in turn
单项选择题
We are kept ______ by clean air.
A. health
B. healthy
C. healthily
D. to be healthy
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