单选题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.AwhatBwhoCthatDwhoever
单选题
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.
A
what
B
who
C
that
D
whoever
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解析：
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