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-- What can trees do _________ us ?
--- They can _________ harmful gases and produce oxygen .
A.helping , take inB.to help , take inC.helping , take outD.to help , take care
B

试题分析:根据题干,本句的意思是“树能为我们做什么?”“他们能吸收有害气体,生产氧气。”第一个空需要用动词不定式表示补充,而第二空表示“吸收”应该用take in。所以本题选B。
点评:动词不定式可以表示补充,做补足语,而动名词却没有此用法;而take out 是“取出”,take care是“照顾”。
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