题目内容
【题目】(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 branches 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,请一定查看水面下有什么。经常有一些石头或树枝藏在水里。investigate是及物动词,后面跟宾语,所以空格处是引导宾语从句,且在宾语从句作主语,指事物,故选A项;B项和D项用于指人,that只有语法意义。
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