Mario used to _____________ in the morning.      
A．practiceswimmingB．practicingswimming
C．practiceswimD．practicesswimming
A               
             
試題分析：考查動詞短語。句意Mario過去常常在早上練習(xí)游泳。Used to 過去常常。Practice doing 練習(xí)做某事，故practise用動詞原形。故選A項(xiàng)。           
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