【2015·浙江】If you swim in a rive

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科目：英语
题型：单选题
难度：中等
人气：248

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题文

【2015·浙江】If you swim in a river or lake, be sure to investigate ____ is below the water surface.Often there are rocks or branched hidden in the water.

A．what

B．who

C．that

D．whoever

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