Your sister must be helping the little girl with her homework, _______ ?
A．needn’t sheB．mustn’t sheC．isn’t she D．must she
C

試題分析：句意為：你的姐姐一定是正在幫助那個(gè)小女孩兒做功課，不是嗎?句中的must不是必須的意思，而是表示對(duì)現(xiàn)在正在發(fā)生的事情的肯定推測(cè)，表示推測(cè)的句子的反意疑問(wèn)句變化時(shí)應(yīng)還原成不推測(cè)的句子，所以這個(gè)句子應(yīng)還原成：Your sister is helping the little girl with her homework,______? 故應(yīng)填isn’t she.答案為C。
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