单项选择题

Betty ______ morning exercises yesterday.

A．not did
B．don't do
C．didn't do
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单项选择题
______ this kind of telephone made in China
A．Will
B．Are
C．Is
单项选择题
I noticed the professor ______ in and ______ down.
A．walk... sit
B．to walk... sit
C．to walk... to sit
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