题目内容

【题目】Mary is busy doing her homework because she wants to hand it in on time. (对划线部分提问)

__________ __________ Mary busy doing her homework?

【答案】Why is

【解析】

画线部分是because引导的原因状语从句,用疑问词why提问,原句是现在进行时,由is和动词现在分词构成,所以填Why is

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