[题目]What he doing?A. do B．is C．can D．are 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】What _______ he doing?

A. do B．is C．can D．are

【答案】B

【解析】句子主语he为第三人称单数，所以系动词或助动词为三单形式，且根据doing，判断句子为现在进行时，所以使用系动词is。

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