【題目】If you want to keep healthy, you should________ some exercise every day.

A. to do B. doing C. did D. do

【答案】D

【解析】

句意：如果你想要保持健康，你應(yīng)該每天做一些鍛煉。to do動詞不定式；doing動名詞；did是do的過去式；do做，動詞原形�？涨暗�should是情態(tài)動詞，后面跟動詞原形，故應(yīng)選D。

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