单项选择题

Never before ______made so great achievements in developing new technology of communication.

A．we have
B．did we
C．have we
D．do we
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单项选择题
May I stay with you and Jack ______ going back to my parent's home this afternoon
A．because of
B．so as to
C．in spite of
D．instead of
单项选择题
I don't know whether it will rain or not, but if it rain, I shall stay at home.
A．does
B．did
C．will
D．shall
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