单项选择题

I would ask George to lend us the money if I ______ him.

A．had known
B．have known
C．knew
D．know
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单项选择题
She was sitting in an armchair ______ a book.
A．reading
B．to read
C．to be reading
D．to have read
单项选择题
We've tested three hundred types of boots, ______ is completely waterproof.
A．no of which
B．none of which
C．some of that
D．neither of which
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