【題目】(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，請(qǐng)一定查看水面下有什么。經(jīng)常有一些石頭或樹(shù)枝藏在水里。investigate是及物動(dòng)詞，后面跟賓語(yǔ)，所以空格處是引導(dǎo)賓語(yǔ)從句，且在賓語(yǔ)從句作主語(yǔ)，指事物，故選A項(xiàng)；B項(xiàng)和D項(xiàng)用于指人，that只有語(yǔ)法意義。

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