He was planning to go abroad but his parents ________ that they wouldn't agree unless he could borrow money from the bank by himself．A.were decidingB.have decidedC.decidedD.will decide
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C解析考查时态。根据were planning可知叙述的是过去的情况，由此可排除B、D两项。decide是短暂性动词，不用于进行时态，所以A项不正确。