单项选择题

His teacher （） concern about the progress he had made at school.

A. expressed
B. exported
C. exploded
D. exposed

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The students should be （） for the things that they do.

A. responsible
B. popular
C. respectful
D. anxious
单项选择题
In order to stay healthy, it is a good idea （） your doctor at least once a year.

A. visits
B. to visit
C. that visits
D. visited
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