单项选择题

(2003)It will not be long____we can have a trip to the moon

A．that
B．after
C．until
D．before
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单项选择题
(2002)She didn’t break the bad news to her mother_____that she might break down.
A．so
B．for fear
C．in order
D．because
单项选择题
(2001)______more than 100 elements are known to us, only 25 of them are common and important.
A．Although
B．If
C．Because
D．Since
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