We had to be patient because it ______ some time ______ we got the full results.
A．was; sinceB．had been; since
C．was; beforeD．would be; before
D

試題分析：固定句式：It be 一段時間 before…一段時間以后某事才發(fā)生；如果before后面使用一般現(xiàn)在時，前面的主語使用將來時；如果before后面使用一般過去時，前面也使用一般過去時；句義：我們不得不耐心等待，因為一段時間以后我們才能得到完全的結(jié)果。本句前面都使用了過去的時態(tài)。故D正確。
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