单项选择题

Doing your homework is a sure way to improve your test scores, and this is especially true ______ it comes to classroom tests.

A．when
B．while
C．as
D．after
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单项选择题
Mr. Smith left for London this morning. I had thought he ______ until next Monday.
A．isn"t going
B．wasn"t going
C．won"t going
D．hasn"t gone
单项选择题
The meeting was put off until next week, which was exactly ______ we wanted.
A．what
B．which
C．that
D．it
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