If Sanlu Group _____ melamine to the milk, the babies _____ too much from kidney stone. [ ]

A. didn't add; would not suffered

B. hadn't added; wouldn't have suffered

C. hasn't added; wouldn't have suffered

D. hadn't added; would have suffered

装载机动力换挡变速器（），会造成换挡离合器磨损、温度升高、打滑。

A.油位过高

B.油位过低

C.换挡油压过高

D.换挡油压过低