— you got to know I traveled to USA?—Through one of your colleagues.A. Where it was that

问题补充：

— you got to know I traveled to USA?

—Through one of your colleagues.

A. Where it was that

B. When was it that

C. How was it that

D. Why was it that

答案：

A. Where it was that

B. When was it that

(答案→)C. How was it that

D. Why was it that

解析：根据答语“Through one of your colleagues.”可知应用表示方式的疑问词how，并用问句形式。