The machine is rather difficult_A.to repairB.repairingC.to be repairedD.being repaired

问题描述:

The machine is rather difficult_A.to repairB.repairingC.to be repairedD.being repaired
为什么不选C选A?
repair ..为什么不用被动?

A.to repair 是对的
C 是被动词