单项选择题

A．to think
B．thinking
C．thinking about
D．to think of
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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
单项选择题
A．alwaysB．againC．usuallyD．very much
A．always
B．again
C．usually
D．very much
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