题目内容：

( ) is Helen she is a taxi driver.a.who b.what

优质解答

b

追问：

There is one office on the first floor？ 对划线部分提问，划线部分是one

追答：

how many offices are there on the first floor

追问：

thank you 回答句是什么？ a.It is my pleasure. b.Not at all . c.That is OK. d.That is all right

追答：

b