---Who left the window _______? ---Sorry. I forgot _______it when I left yesterday.A.opened; to closeB.open; to closeC.open; closingD.opening; closing
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B解析考查情景交际。“谁没有关窗户？”“对不起，昨天我离开时忘记关了。”open可以作形容词，意为“开着的”，表示状态。forget to do sth.“忘记要做某事”；forget doing sth.“忘记做过某事”。本题意思是“没关”，故用forget to do。故选B。