Question

 Mario used to _____________ in the morning.      

A．practiceswimming	B．practicingswimming
C．practiceswim	D．practicesswimming

Answer 1

A               

             
试题分析：考查动词短语。句意Mario过去常常在早上练习游泳。Used to 过去常常。Practice doing 练习做某事，故practise用动词原形。故选A项。