题目内容
【题目】---What is he doing?--He__________ reading a book.
A. is B. does C. has
【答案】A
【解析】题干为现在进行时，题中填空处应为和he相搭配的系动词is，所以选A。
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题目内容
【题目】---What is he doing?--He__________ reading a book.
A. is B. does C. has
【答案】A
【解析】题干为现在进行时，题中填空处应为和he相搭配的系动词is，所以选A。