Researchers from developed countries have gathered ______ the effects of water

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问题 Researchers from developed countries have gathered ______ the effects of water pollution on this area.

选项 A、analyze
B、to analyze
C、analyst
D、analysis

答案 B

解析语法题。横线前的句子成分完成，横线后面的内容为动词不定式表目的，故选B。

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Researchersfromdevelopedcountrieshavegathered______theeffectsofwater