单项选择题

—______ did the first man walk on the moon —In 1969.

A． What
B． Where
C． When
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单项选择题
Since the ground is wet, it ______ last night.
A． must have rained
B． had rained
C． must rain
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
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