单项选择题

I feel that one of my main duties （）a teacher is to help the students to become better learners.

A. for
B. by
C. as
D. with

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单项选择题

We thought of selling this old furniture, but we’ve decide to （）it. It might be valuable.

A. hold on to
B. keep up with
C. turn to
D. look after

单项选择题

People try to avoid public transportation delays by using their own cars, and this （）creates more problems.

A. after all
B. once again
C. in case
D. in turn

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