【題目】What _______ he doing?

A. do B．is C．can D．are

【答案】B

【解析】句子主語he為第三人稱單數(shù)，所以系動(dòng)詞或助動(dòng)詞為三單形式，且根據(jù)doing，判斷句子為現(xiàn)在進(jìn)行時(shí)，所以使用系動(dòng)詞is。

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