单项选择题

______ a teacher, one must first be a pupil.

A. Being
B. Having been
C. To be
D. To have been
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单项选择题
The company has to () the benefits against the costs in the last three months.

A. boast
B. blame
C. block
D. balance
单项选择题
The teacher has his students () a composition every other week.

A. to write
B. written
C. writing
D. write
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