--Charles says you should have reported the accident to the police.--I don’t know ______ good they could have done.

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问题 --Charles says you should have reported the accident to the police.--I don’t know ______ good they could have done.

选项 A、how
B、that
C、what
D、which

答案C

解析 注意本题中的good为名词,do good(to)“对……有效、有益”为一固定词组,根据下文“我不知道他们能起什么有益的作用”可知What在句中起连结和限定的双重作用。
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