单项选择题

This is one of the books that ______ on this subject.

A．have been written
B．has been written
C．written
D．wrote
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单项选择题
He found ______ rather happy to cooperate with her.
A．that
B．so
C．it to be
D．it
单项选择题
Yon can drive your own car ______ you have passed the driving test.
A．now that
B．so that
C．even if
D．as if
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