单项选择题

I saw them ______ in the river.

A． swam
B． to swim
C． swim
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单项选择题
Both Xiao Li and Peter ______ in the same university.
A． works
B． work
C． worked
单项选择题
I noticed the professor ______ in and ______ down.
A． walk... sit
B． to walk... sit
C． to walk... to sit
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