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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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