单项选择题

It was long ______ she returned my book to me.

A．when
B．since
C．that
D．before
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单项选择题
We have no doubt ______ the Chinese team will win gold medal after gold medal in the Olympic Games in Athens in Greece.
A．whether
B．if
C．what
D．that
单项选择题
He's working hard for fear that he ______.
A．should fall behind
B．fell behind
C．may fall behind
D．would fallen behind
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