单项选择题

— I think it is going to be a big problem.
— Yes, it could be. I wonder（）we can do about it.

A. if
C. what
B. how
D. that

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The idea（）we invited him yesterday is quite good.

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

A. for
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B. by
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