Fruit and vegetables are good for us. We need them __________ healthy.
A．keepB．keeping C．to keep D．keeps
C

試題分析：句意:水果和蔬菜都對(duì)我們是有益的，我們需要它們來保持健康。這里的謂語動(dòng)詞need，動(dòng)詞不定式來作目的狀語，根據(jù)句意故選C。
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