Andy went to play football after____his homework.A.finish B.finishes C.finished D.finishing

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Andy went to play football after____his homework.A.finish B.finishes C.finished D.finishing
Andy went to play football after____his homework.A.finish B.finishes C.finished D.finishing

Andy went to play football after____his homework.A.finish B.finishes C.finished D.finishing
显然是D,after是介词,其后接动词的非谓语形式,此处为动名词,即finishing.
另一种形式是after he finished his homework.