【题目】Before, he couldn’t _______. Now, he can _______ fast. ( )
A.swim; swimB.swam; swimC.swam; swimming
【答案】A
【解析】
句意：以前，他不会游泳。现在，他能游得很快。前后都有情态动词，所以后面的动词应该用动词的原形。故选A。
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