单项选择题

Jerry seldom came to the laboratory,（）he

A．did
B．didn't
C．does
D．doesn't

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单项选择题

Either you or Lin Ming（）supposed to do the job.

A．are
B．be
C．being
D．is

单项选择题

I have not gone to see the doctor for a long time, but today（）

A．I'm going to
B．I'm going to see
C．I'm going
D．I go

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