单项选择题

Three years ______ a short time. You have to study hard.

A． is
B． are
C． be
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单项选择题
He walked so ______ that he missed the last bus.
A． fast
B． slowly
C． quickly
单项选择题
Do you think a foreign language is ______ than maths
A． as difficult
B． more difficult
C． the most difficult
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