单项选择题

Only after entering the classroom, ______ that he made a mistake.

A．did he realize
B．he realized
C．he realizes
D．does he realize
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单项选择题
Little ______ about him when I first met him in that company.
A．have I known
B．I knew
C．did I know
D．I know
单项选择题
Many companies provide their employees ______ free lunch during the weekdays.A. by B. with C. to D for
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