-- 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

試題分析：根據(jù)題干，本句的意思是“樹能為我們做什么？”“他們能吸收有害氣體，生產(chǎn)氧氣�！钡谝粋�空需要用動詞不定式表示補充，而第二空表示“吸收”應該用take in。所以本題選B。
點評：動詞不定式可以表示補充，做補足語，而動名詞卻沒有此用法；而take out 是“取出”，take care是“照顧”。
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