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

分析 我们必须保护植物,因为他们是我们的朋友.

解答 答案:D 根据语境可知,we 我们,是人称代词主格形式;us我们,是宾格形式;our 我们的,是形容词性物主代词;ours我们的,是名词性物主代词.friends of ours,我们的朋友,这里是双重所有格的形式.故选D.

点评 本题考察物主代词的用法.形容词性物主代词相当于形容词,在句中只能用作定语,后面必须跟名词.名词性物主代词可以用在介词of的后面,相当于"of+名词所有
格".

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