单项选择题

Stop ______,boys! It's time for class.

A．talking
B．to talk
C．talk
D．being talk
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单项选择题
Not until quite recently ______ he gave up his plan to go abroad.
A．I knew
B．I had known
C．did I know
D．I did know
单项选择题
It was your brother ______ I met at the station.
A．who
B．whom
C．that
D．why
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