[解題] 如何解釋這題文法

[LYCH (Time is running out)]

(     )  Mrs. Brown is opening the door, not ˉˉˉˉ it.
(A) is closing　(B) close　(C) closes　(D) closing

答案是d
但是該如何跟小朋友解釋呢
請各位老師幫忙
謝謝

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