Not until we have had a chance to discuss it thoroughly ________ perfectly．A.the problem has been settledB.has the problem been settledC.will the problem be settledD.the problem was settled
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C解析考查倒装句。Not until……that……当主句是否定句时，它引出的意思是“直到(某时)(某动作)才(发生)”，这时候常会出现“not until…”的结构，如果将“not until…”的结构放在句首，那么主句要写成倒装句。