单项选择题

Factory workers had to work very hard before, so had farmers.

A．had to
B．very hard
C．so
D．had farmers
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单项选择题
We are all for your proposal that the discussion is to be put off.
A．are
B．for
C．that
D．is to be put off
单项选择题
I made a call to my parents yesterday. To my disappointment, _____ of them answered it.
A．either
B．none
C．neither
D．nobody
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