If you don't like the drink you _____(order),just leave it and try a different one.

If you don't like the drink you _____(order),just leave it and try a different one.
A.ordered B.are ordering C.will order D.had ordered答案是A我选D,不是说一般过去式是有具体的过去时间 而完成时是没具体时间的吗?