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        1. --- What should I do, doctor?
          ---         healthy,  you should take more exercise.
          A.KeepB.To keepC.KeepingD.To keep out
          B
          考查非謂語(yǔ)動(dòng)詞.句意:醫(yī)生,我該做什么?_為了保持健康,你應(yīng)該多鍛煉.不定式作目的狀語(yǔ),表示具體的將要進(jìn)行的動(dòng)作, keep out是阻止進(jìn)入的意思,keep是保持的意思,故選B.
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