单项选择题

The theory they stuck to ______ true.

A．proving
B．proved
C．be
D．being
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单项选择题
He hardly knows a word of English, ______
A．didn't he
B．doesn't he
C．does he
D．has he
单项选择题
It has been 10 years ______ he left his hometown.
A．since
B．after
C．until
D．unless
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