单项选择题

The question is ______ difficult that no one in the class is able to give the answer.

A． very
B． so
C． too
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单项选择题
It's going to rain. You'd better ______ an raincoat with you.
A． take
B． taking
C． to take
单项选择题
You can choose ______ of the two tapes, if you like.
A． all
B． no
C． either
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