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         you turn off all the lights when you leave the classroom．  
A．Making sureB．To make sureC．Being sureD．Make sure
D
考查祈使句：句意是：當(dāng)你離開教室時(shí)要把所有的燈都關(guān)了。根據(jù)句式判斷應(yīng)該用祈使句。選D。
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