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 动词investigate后面接宾语从句,且从句中缺少主语,又根据后一句“通常有些岩石或树枝隐藏在水底下”可知此处选what。
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