Question

【題目】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：邁克必須每周在游泳池里練習(xí)兩次______。practice doing sth練習(xí)做某事，A游泳，動詞原形，B游泳，動詞過去式，C去游泳，動詞不定式，D游泳，動詞ing，故選D。