单项选择题

The teacher has his students ______ a subject report every month.

A．to write
B．written
C．writing
D．write
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单项选择题
Scarcely had he gone out ______ .
A．that is started to snow
B．than it started to snow
C．when it started to snow
D．and it started to snow
单项选择题
He ______ reading silently at first.
A．used not to
B．didn't use to
C．was not used to
D．is not used
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