单项选择题

The Changjiang River is ______ river in China,isn' t it

A． long
B． longer
C． the longest
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单项选择题
I saw them ______ in the river.
A． swam
B． to swim
C． swim
单项选择题
Both Xiao Li and Peter ______ in the same university.
A． works
B． work
C． worked
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