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Ann, _____ the lights when you leave the classroom.
A.turn onB.turns onC.turns offD.turn off
D

试题分析:句意:安,当你离开教室的时候关上灯。A. turn on打开; B. turns on打开,动词三单形式;C. turns off关上,动词三单形式;D. turn off关上。本句是祈使句,肯定祈使句以动词原形开头,结合语境,故选D。
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