单项选择题

It was not long ______ the rain stopped and the bright sun came out again.

A．that
B．ago
C．before
D．until
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单项选择题
It is necessary for students to take tests at monthly ______.
A．intervals
B．times
C．periods
D．terms
单项选择题
Every field of chemistry ______ different chemical reactions.
A．holds
B．consists
C．composes
D．involves
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