来自段翀的问题
【英语习题Althoughthefirstpartofthebookiseasy,therest______.A.aredifficultB.hasproveddifficultC.issupposeddifficultD.havebeenfounddifficult为什么选B】
英语习题
Althoughthefirstpartofthebookiseasy,therest______.
A.aredifficult
B.hasproveddifficult
C.issupposeddifficult
D.havebeenfounddifficult
为什么选B
