Question

【题目】Mario used to in the morning.

A. practice swimming B. practicing swimming

C. practice swim D. practices swimming

Answer 1

【答案】A

【解析】

试题分析：句意：马里奥过去常常在早晨练习游泳。本句中to是不定式符号，后面接动词原形，practice后面要跟动词ing形式，故选A。