It’s certainly been a long time we met last time.A. thatB. beforeC. untilD. since

问题补充：

It’s certainly been a long time we met last time.

A. that

B. before

C. until

D. since

答案：

A. that

B. before

C. until

(答案→)D. since

解析：连词辨析。A. 那个，多引导从句； B.在……之前； C. 直到……；D. 自从……以来。句意：自从我们上次见面确实有很长时间了。故选D。