单项选择题

He usually goes to the park ______ Sunday morning.

A． at
B． in
C． on
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单项选择题
Mary usually gets up early, ______ she
A． does
B． is
C． doesn't
单项选择题
When I opened the door, I found a cat ______ in the rain.
A． lie
B． lying
C． lay
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