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--Could you tell me              ?

--By underground．

A．how did you come here                  B．how you came here

C．when did you come here                       D．when you came here

—Could you tell me _______?

—By underground．

A．how you came here                   B．how did you come here

C．when did you come here              D．when you came here

—Could you tell me_________?

—By underground.

-- Excuse me. Could you tell me ____?

- By underground.

A．how did you come here                  B．how you came here

C．when did you come here                 D．when you came here