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seconds, minutes, years, which, that, what The traffic was held up for more than thirty __________,__________caused me to come late.
【正确答案】：minutes, which
【题目解析】：此句意思是交通堵塞了三十多分钟，这使得我迟到了。交通堵塞三十秒或三十年语义不通，后面分句与前面主句有逗号分隔，所以是非限制性关系分句，用which引导。