题目内容
_____is a good of exercise for both the young and the old.
A. The walk B. Walking C. To walk D. Walk
B
解析:
不定式和动名词都可作主语,常可互换。但在表示特定的、具体的、特别是将来的动作时,常用不定式;而在表示泛指、习惯性的动作时,常用动名词。
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