______ is a good form of exercise for both young and old.A、WalkingB、To walkC、T

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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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