单项选择题

I would have come sooner but I ______ that you were waiting.

A．haven't known
B．hadn't known
C．didn't know
D．have known
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单项选择题
George, like all boys, ______ cars very much.
A．like
B．are liking
C．liking
D．likes
单项选择题
I'll lend you my computer ______ you promise to take care of it.
A．unless
B．while
C．as
D．if
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