【題目】 _______can help you keep healthy.

A. Do exercise B. Doing exercise C. Do exercises D. Doing exercises

【答案】B

【解析】試題分析：句意：鍛煉可以幫助你保持健康。動名詞短語做主語，exercise為不可數(shù)名詞意為“鍛煉，運動”；故選B。

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