单项选择题

I______ from him since he left.

A．didn't hear
B．haven't heared
C．haven't heard
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单项选择题
Neither Peter ______ Jack works in this factory.
A．or
B．nor
C．either
单项选择题
Xiao Zhang ______ in this company for three years.
A．has worked
B．worked
C．works
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