单项选择题

Every one can only play the games for ten minutes ______.

A．at a time
B．at any time
C．at times
D．at one time
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单项选择题
______ is expected, all the students in his class passed the final examination.
A．As
B．Which
C．That
D．What
单项选择题
Since the ground is wet, it ______ last night.
A．must rain
B．must have rained
C．had rained
D．rained
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