As we know, is good exercise and it is necessary for health.A. walk B. walks C. walking 题目和参考答案——青夏教育精英家教网—

题目内容

As we know, ________ is good exercise and it is necessary for health.

A. walk B. walks C. walking

【解析】

试题分析：句意:众所周知，散步是一种好的锻炼方式并且这对健康是必不可少的。句子中缺少主语，应使用动名词充当主语。故选C。

考点：考查非谓语动词。

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