If you swim in a river or lake, be sure to investigate______is below the water surface. Often there are rocks or branches hidden

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问题 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.

选项 A、what
B、who
C、that
D、whoever

答案A

解析 本题考查宾语从句。句意为“如果你想在河流或湖泊里游泳,一定要调查水面下有什么东西。通常会有石头或者树枝藏在水里”。B、D两项用来指人,故排除。空格处所填词既要引导宾语从句,又要作从句的主语。故本题选A。
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