题目内容

() 4. We have friends to help us fight against pollution,and trees are one of.

 A.themselves   B. they   C. their   D. them

4.D

4.D (考查人称代词用法。题意:我们有很多朋友帮助我们和污 染作斗争，树木就是其中之一。themselves反身代词;they人 称代词主格;their形容词性物主动词；them人称代词宾格，放 在of后面，用人称代词的宾格形式。故答案为D.)

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