I’m sure he didn’t know (exact) ______ what he was doing while the accident took

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问题 I’m sure he didn’t know (exact) ______ what he was doing while the accident took place.

选项

答案 exactly

解析本题考查副词的用法。本句需要一个副词修饰宾语从句的谓语动词know，而exact是形容词，不能直接修饰动词作状语，必须转化成副词的形式。

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Someinvestigationsshowthatthecauseoftheaccidentmaybetheplaneengine’