By the time you arrive this evening,____ for two hours.A.I will s_英语解答

By the time you arrive this evening,____ for two hours.
A.I will study
B.I will have been studied
C.I had studied
D.I will have been studying
B和D区别在哪儿啊？

人气：212 ℃　时间：2019-12-06 06:57:17

解答

选D
“by the time +将来时间”,用于将来完成时[will have done]或将来完成进行时[will have been doing],排除A,C
又由于B项是表示被动的,错误,故选D