单项选择题

Before we moved to America, we （） in Australia for ten years.

A. lived
B. living
C. had lived
D. have lived

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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
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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