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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