【題目】We must thank trees ____ oxygen into the air .
A.produce
B.to produce
C.for produce
D.for producing

【答案】B
【解析】trees to procuce oxygen into the air,像空氣中產(chǎn)生氧氣的數(shù),此處是動詞不定式作后置定語,故選 B。

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