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---Could you let me know ________ yesterday ?

---Because the traffic was heavy .

A. why did you come late           B. why you came late

C. why do you come late           D. why you come late

---Could you let me know ________ yesterday?

---Because the traffic was heavy.

A. why did you come late                    B. why you come late

C. why do you come late                           D. why you came late

—Could you let me know     yesterday?

— Because the traffic was heavy.

A. why did you come late            B. why you came late

C. why do you come late             D. why you come late