I usually forget ________ the door, but I remember ________ it yesterday．
A.shutting…shutting
B.to shut…to shut
C.shutting…to shut
D.to shut…shutting
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D解析forget to do sth．忘记做某事(这个事没做)．forget doing sth．忘记已经做过的事．remember to do sth．记住去做某事(这个事还没做)．remember doing sth．记住已经做的事情．