withteenswhospendmuchoftheirfreetimeinfrontofTVs...

問題詳情：

        with teens who spend much of their free time in front of TV sets, those who are physically active often have better grades.

         A. Compared          B. To compare          C. Comparing           D. Having compared

【回答】

A

知識點：非謂語動詞

題型：選擇題