单项选择题

So little ______ about mathematics that the lecture was completely beyond me.

A．I know
B．I knew
C．did I know
D．do I know
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单项选择题
Many a person ______ that kind of experience.
A．have
B．has
C．having
D．are having
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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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