20．We must protect plants because they are friends of____．（　　）
A．weB．usC．ourD．ours

分析 我們必須保護植物，因為他們是我們的朋友．

解答 答案：D 根據(jù)語境可知，we 我們，是人稱代詞主格形式；us我們，是賓格形式；our 我們的，是形容詞性物主代詞；ours我們的，是名詞性物主代詞．friends of ours，我們的朋友，這里是雙重所有格的形式．故選D．

點評 本題考察物主代詞的用法．形容詞性物主代詞相當(dāng)于形容詞，在句中只能用作定語，后面必須跟名詞．名詞性物主代詞可以用在介詞of的后面，相當(dāng)于"of+名詞所有
格"．

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