单项选择题

Not until I began to work ______ how much time I had wasted.

A．didn’t realize
B．did I realize
C．I didn’t realize
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单项选择题
He is ______ than the other boys in his class.
A．more taller
B．tallest
C．taller
单项选择题
It ______ heavily so there was deep snow on the road.
A．snows

B．snowed

C．had snowed
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