单项选择题

Did you see them ___________ in the river just now

A．to swim
B．swam
C．swimming
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单项选择题
When you got home, they ___________.
A．had left
B．have left
C．have went away
单项选择题
The ___________ you climb, the ___________ sight(风景) you can enjoy.
A．higher.., beautiful
B．higher.., more beautiful
C．more higher.., more beautiful
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