The windows must _________ before you leave the room.
A．be closed B．a(chǎn)re closedC．close D．be close
A
考察時(shí)態(tài)。句意：在你離開(kāi)房間之前，不許關(guān)上窗戶。結(jié)合語(yǔ)境可知本句主語(yǔ)為動(dòng)作對(duì)象，故用被動(dòng)語(yǔ)態(tài)。選A。
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