Your car should be ready by 12 o’clock but I’ll let you know.A. if possibleB. if everC.

问题补充：

Your car should be ready by 12 o’clock, but , I’ll let you know.

A. if possible

B. if ever

C. if anything

D. if not

答案：

A. if possible

B. if ever

C. if anything

(答案→)D. if not

解析：考查省略句，A. if possible 如果可能B. if ever如果曾经有C. if anything如果有一些，D. if not如果不，完整的应该是if your car is not ready by 12 oclock, I will let you know，句意：你的车应该在12点前准备好，但如果没有准备好，我会让你知道。选D。