—Seems you are quite familiar with Russia.—That is because I the country in 1999.A. have

问题补充：

—Seems you are quite familiar with Russia.

—That is because I the country in 1999.

A. have visited

B. was visiting

C. had visited

D. visited

答案：

A. have visited

B. was visiting

C. had visited

(答案→)D. visited

解析：该句有明显的过去时时间状语