—Sorry for having kept you waiting ．But for the traffic jam,I________20 minutes earlier．—Never mind．I haven’t been waiting that long．A.arrivedB.would arriveC.would have arrivedD.had arrived
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C解析but for 倘若不是，如果没有。后面的动词用过去将来时（表与现在或将来事实相反）或过去将来完成时（表与过去事实相反）。既然已经迟到，让对方久等，很显然是针对过去情况做的假设。因此选C。