单项选择题

The two old women ______ each other since 1980.

A． didn't seen
B． don't see
C． haven't seen
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Three years ______ a short time. You have to study hard.
A． is
B． are
C． be
单项选择题
He walked so ______ that he missed the last bus.
A． fast
B． slowly
C． quickly
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