If you can't turn the key,try -----some oil in the lock A.to

If you can't turn the key,try _____some oil in the lock A.to put.B.putting 为什...If you can't turn the key,try _____some oil in the lockA.to put.B.putting为什么?转钥匙和放油并不是一个动作,为什么是用putting呢