单项选择题

The headmaster required that all the teachers （）at the meeting.

A. present
B. must be present
C. be present
D. would be present

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单项选择题
The bus stopped at the bus stop to （） the three men waiting there.

A. pick up
B. have up
C. take up
D. put up
单项选择题
（）arriving at the spot, the policemen at once helped the passengers to safety.

A. At
B. On
C. The moment
D. As
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