单项选择题

The Yellow River is the second ______ fiver in China.

A．long
B．longer
C．longest
D．most long
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单项选择题
It's no use ______ over spilt milk.
A．cry
B．to be crying
C．crying
D．cried
单项选择题
He has just taken an examination ______ chemistry.
A．for
B．about
C．on
D．in
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