单项选择题

A．over
B．at
C．on
D．of
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单项选择题
A．refuseB．prohibitC．preventD．avoid
A．refuse
B．prohibit
C．prevent
D．avoid
填空题
They advise people not to turn their computers on that day or to leave the computers on continually from March 5th to March 7’h.
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