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英语句子改错/His first question was if Holmes had arrived yet.最主要说

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英语句子改错/
His first question was if Holmes had arrived yet.
最主要说明理由,答案不是重点,
His first question was whether Holmes had arrived yet.
再问: 为什么???
再答: 因为你的这个句子里was后面是一个表语从句, 但是if是不可以引导表语从句的, if引导的从句是表示条件的状语从句, whether才能引导表语从句. 例: If you are not happy, you'd better not go with us.