单项选择题

It was not until he closed the door ______ he ______ he forgot Io take the keys with him.

A．that, realized
B．did, realize
C．which, realized
D．when, realized
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单项选择题
He felt helpless in a situation ______ he could not move himself.
A．where
B．which
C．that
D．while
单项选择题
In me he found an ______ listener, who, by virtue of book reading, knew much about the sea-life he had lived.
A．appreciative
B．appreciate
C．appreciated
D．appreciating
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