Ann’s family ________ for two years ________ they were discovered．
A.hid away; beforeB.were hiding; beforeC.hid away; asD.were hiding; as在线课程A
该句的第二个空，只能用before，因为as表示两个动作同时发生．前一个空可以用过去完成时，但hide是延续性动词，过去时也可以和一段时间连用．
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