They ____ the car this morning ....

问题描述:

They ____ the car this morning ....
They ____ the car this morning .Maybe they'll finish it this afternoon.
A.mended B.have been mending C.hae mended D.will mend
D 为什么。

B.have been mending
根据句意,the car是一直在修的,故要用完成进行时.