单项选择题

Since the ground is wet, it ______ last night.

A． must have rained
B． had rained
C． must rain
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单项选择题
The children are standing ______ the starting line and are ready ______ run.
A． at, to
B． at, for
C． in, to
单项选择题
The old man lived ______ , but he was not ______.
A． lonely, alone
B． alone, lonely
C． lonely, lonely
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