______ is a good form of exercise for both young and old.

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问题 ______ is a good form of exercise for both young and old.

选项 A、Walking
B、To walk
C、The walk
D、Walk

答案A

解析 [A]Walking 动名词做主语,是正确答案。[B]To walk有还没做而将要去完成的意味,不符题意。
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