单项选择题

He must be in the building because he was seen（）the building just now.

A. entering
B. enter
C. to enter
D. having entered

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单项选择题
His teacher （） concern about the progress he had made at school.

A. expressed
B. exported
C. exploded
D. exposed
单项选择题
The students should be （） for the things that they do.

A. responsible
B. popular
C. respectful
D. anxious
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