问题: 一道英语单选
He’s ———— as a “bellyacher” —he’s always complaining about something .
A．who is known B．whom is known C．what is known D．which is known
答案是什么？愿闻其详
解答:
选A。是表语从句，从句语态为被动，引导词作主语代人用who。
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