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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单项选择题
No sooner had they got off the train ______ it started moving.
A．when
B．than
C．then
D．after
单项选择题
I am very sorry for ______ for so long.
A．keep you waiting
B．having kept you waiting
C．waiting for you
D．keep you wait
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