【題目】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】D
【解析】在“it＋be＋一段時間＋before/after/since＋從句”句型中，before從句中的動作經(jīng)過一段時間后才會實現(xiàn)；after從句中的動作發(fā)生后已經(jīng)過去了一段時間；since從句中的動作完成后到現(xiàn)在已經(jīng)有一段時間了。

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