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.

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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?