题目内容

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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