---Paul, why didn’t you close the windows yesterday?---Really? I remember______ them before I left.A.to closeB.closingC.not to closeD.not closing
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B解析考查remember的用法。remember to do sth.表示记得要做某事；remember doing sth.表示记得曾经做过某事。根据句意“Paul，昨天怎么没关窗户？”“真的吗？我记得离开前关了啊。”故用“记得做过某事”这一个意思，即用doing形式。故选B。