pay off和pay back选题The teacher's efforts ___when one of his students was admitted to Beijing university last summer.用pay back还是pay off?给我理由.

问题描述:

pay off和pay back选题
The teacher's efforts ___when one of his students was admitted to Beijing university last summer.
用pay back还是pay off?给我理由.

选pay off:得到好结果,取得成功的意思