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Peter is busy _ _ at school, but he never forgets _ __ exercise every day.
A. working; doing B. working; to do C. at work; doing
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解答
B
知识点
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举一反三
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As we all know ,Columbus America and Edison light bulbs.
A．discovered ; invented B．invented ; discovered C．discovered ; discovered D．invented ; invented -
Joy, what happened to the plane?
It ___ at midnight, but it didn’t land on the airport on time.A．took off B．put off C．turned off D．got off -
Mr. White spent about one hour and a half _________ the accident report yesterday evening.A．write B．written C．writing D．to write
