Question

【题目】Mike has to practice ____ in the swimming pool twice a week. ( )

A.swim

B.swam

C.to swim

D.swimming

Answer 1

【答案】D

【解析】

句意：迈克必须每周在游泳池里练习两次______。practice doing sth练习做某事，A游泳，动词原形，B游泳，动词过去式，C去游泳，动词不定式，D游泳，动词ing，故选D。