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Grandfather  doesn’t often     So he isn’t good in heath.
A.exercisesB.exercise
C.to exerciseD.exercising
B

试题分析:句意:爷爷不经常锻炼,因此它的健康不佳。结合语境可知本句描述的是反复性动作,故用一般现在时态。句子中已有助动词doesn’t体现时态及人称,故行为动词用原形。选B。
点评:英语中的谓语动词有各种时态,当句子中有情态动词或者助动词时,行为动词一般用原形。
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