单项选择题
Not until I began to work ______ how much time I had wasted.
A．have I realized
B．I have realized
C．did I realized
D．I realized
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单项选择题
It's better to avoid ______ downtown during the rush hour.
A．to drive
B．driving
C．having driven
D．to be driving
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单项选择题
I usually walk ______ the river bank over there, but today I feel tired and won't walk far.
A．as long as, so
B．as far as, that
C．as often as, such
D．as soon as, very
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