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We had to be patient because it___some time ___we got the full results.
A.has been ; sinceB.had been ; until
C.was; afterD.would be ; before
D
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。
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