Mr.Johnson arrived here about half an hour ago.(对划线部分提问)划线部分是about half an hour ago.

问题描述:

Mr.Johnson arrived here about half an hour ago.(对划线部分提问)划线部分是about half an hour ago.

When did Mr. Johnson arrive here?

When did Mr.Johnson arrive here ?
What time did Mr.Johnson arrive here ?
At what time did Mr.Johnson arrive here ?

When did Mr.Johnson arrive here