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    精英家教网 > 高中英语 > 题目详情

    【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，故选A。

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