单项选择题

I've never seen you ______ behind the door.

A．standing
B．stands
C．to stand
D．stood
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单项选择题
Either of you ______ able to move that stone.
A．are
B．is
C．have been
D．be
单项选择题
It was in that town ______ I was born.
A．as
B．when
C．which
D．that
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