题目内容
_____ is a good form of exercise for both young and old.
A. Walk B. Walking
C. The walk D. To walk
B
解析:
最佳答案为B。尽管walk用作名词时可以表示“散步”,但它是可数名词,指的是一次一次的具体的散步,而不表示抽象意义或泛指意义的“散步”,要表示此义,要用动名词 walking。
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