【題目】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，請確定查看水面下有什么？通常總有一些石頭或樹枝藏在水里，此處的what指代的是樹枝或石頭，B選項和D選項用于指人，that只有語法意義，句式上，該句用了（If從句，祈使句）的句式，非謂語to investigate后接一個賓語從句的表達，分析賓語從句的成分可以發(fā)現(xiàn)，空格所做的成分是主語，根據(jù)下一句的表述中的樹枝和石頭，可以得出答案是what.

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