单项选择题

Alice began to learn English since 5 years ______.

A． before
B． ago
C． later
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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
单项选择题
It's going to rain. You'd better ______ an raincoat with you.
A． take
B． taking
C． to take
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