____ is good for our health .It's my favourite sport .A.Swim B.Swimming C.Swims为什么选B请详解.
问题描述：
____ is good for our health .It's my favourite sport .A.Swim B.Swimming C.Swims
为什么选B请详解.
答
动词原形和第三人称单数不能充当句子主语
B是用动名词作主语，是可以的
答
B
答
“游泳对身体好”
因为这里是动名词做主语,动词时不能作主语的.swim是动词,swimming是动名词形式