We close friends since we got to know each other in 2006, and we always keep in touch.
A. were
B. have been
C. will be
D. had been
网友回答
A. were
(答案→)B. have been
C. will be
D. had been
解析：考查时态。Since自从，其主句一般用现在完成时。
句意：自从我们2006年认识至今，我们仍然是很亲密的朋友，并且一直保持联系。