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She has caught cold，because she completely forgot ______ the windows last night.
A、locking
B、being locked
C、to lock
D、to have locked
【正确答案】：C
【题目解析】：译文：她感冒了，因为昨晚她完全忘记关窗户了。此题考查动词forget的用法。forget to do sth意为“忘记去做某事(没有做)”；forget doing sth意为“忘记已经做过的事”。