[题目]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.whatB.whoC.thatD.whoever 题目和参考答案——青夏教育精英家教网—

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【题目】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

【答案】A
【解析】：句意：如果你在河里或湖里游泳，请确定查看水面下有什么？通常总有一些石头或树枝藏在水里，此处的what指代的是树枝或石头，B选项和D选项用于指人，that只有语法意义，句式上，该句用了（If从句，祈使句）的句式，非谓语to investigate后接一个宾语从句的表达，分析宾语从句的成分可以发现，空格所做的成分是主语，根据下一句的表述中的树枝和石头，可以得出答案是what.

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