单项选择题

A．when
B．then
C．that
D．than
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单项选择题
A．to thinkB．thinkingC．thinking aboutD．to think of
A．to think
B．thinking
C．thinking about
D．to think of
单项选择题
You ______ drink water that is not
A．had better not; boil
B．had not better; boiled
C．had better not; boiled
D．wouldn’t; boiling
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