________ Reyes admits that he has enjoyed a quick rise to the top, the road to success has not always been smooth.A.WhileB.SinceC.AsD.If
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A解析句意：虽然Reyes承认在前进的道路上他进步很快，但是通向成功的路并不总是平坦的。while--although虽然。如：While I admit that there are problems, I don't agree that they cannot be solved.尽管我承认有问题存在，但我不同意说这些问题不能解决。