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
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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
单项选择题
______ makes men different from the other animals is that they can think and speak.
A．That
B．The thing
C．All
D．What
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