单项选择题

A healthy life is frequently thought to be（）with the open countryside and home-grown food．

A.tied
B.related
C.involved
D.associated

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单项选择题

We must know what we should do and what we should avoida（）good impression on others in public place．

A.to leave
B.leaving
C.to have left
D.leave

单项选择题

The principal walked onto the platform and seated himself in a chair，（）for answering questions.

A.prepare
B.being prepared
C.prepared
D.preparing

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