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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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
Three years ______ a short time. You have to study hard.
A．is
B．are
C．be
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