We had to be patient because it＿＿＿some time ＿＿＿we got the full results. A. has been ； sinc

问题补充：

We had to be patient because it＿＿＿some time ＿＿＿we got the full results.

A. has been ； since

B. had been ； until

C. was； after

D. would be ； before

答案：

A. has been ； since

B. had been ； until

C. was； after

(答案→)D. would be ； before

解析：在it ＋be＋一段时间＋before/after/since句型中，before从句中的动作经过该段时间后才会实现；after从句中的动作完成后已经过去了一段时间；since从句中的动作完成后到现在已经有一段时间了。