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

試題分析：句意:我們必須保護植物，他們是我們的朋友。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。
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