【題目】It's good for us to every day .

A. do morning exercise B. do morning exercises

C. doing morning exercise D. doing morning exercises .

【答案】B

【解析】句意：每天做早操對(duì)我們有好處。根據(jù)句型It’s good for sb to do sth做某事對(duì)于某人來說是……。此處exercise當(dāng)“練習(xí)”“體操”時(shí)，是可數(shù)名詞，當(dāng)故選B。

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