单项选择题

It is not clear yet when the workers( )strike will return to their factories.

A. in
B. at
C. on
D. from
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Our delay was due( )the heavy traffic.
A. to
B. at
C. in
D. with
单项选择题
They objected( )smoking in public places.
A. that
B. to
C. in
D. at
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