Don’t forget the door when you leave.A. to closeB. closeC. closingD. closed

问题补充：

Don’t forget the door when you leave.

A. to close

B. close

C. closing

D. closed

答案：

(答案→)A. to close

B. close

C. closing

D. closed

解析：句意:当你离开时,不要忘了关门. forget后接不定式表示不要忘记去做某事,接动名词表示忘记了做某事. 结合语境可知选A.