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We must protect plants. They are friends of ______.
A.weB.us
C.ourD.ours
D

试题分析:句意:我们必须保护植物,他们是我们的朋友。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。
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