单项选择题

Do help yourself to some fruit, _______you

A．can’’t
B．don’’t
C．wouldn’’t
D．won’’t
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单项选择题
James has just arrived, but I didn’’t know he_______until yesterday.
A．will come
B．was coming
C．had been coming
D．came
单项选择题
What steps could be taken to improve the air
A．Reduce the amount of nitrogen.
B．Increase the release of oxygen.
C．Reduce nitrous oxide emissions.
D．Stop industrial activities.
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