来自李允的问题
We____sixdaysaweekfortenyears.butweonlyworkfivedaysnow.A.haveusedtoworkB.usedtoworkC.havebeenusedtoworking.D.haveusedtoworking
We____sixdaysaweekfortenyears.butweonlyworkfivedaysnow.
A.haveusedtoworkB.usedtoworkC.havebeenusedtoworking.D.haveusedtoworking

