3道单选题目(初2)

问题描述:

3道单选题目(初2)
I will give the message to him as soon as he _______ back tomorrow.
A. comeB. comesC. will comeD. came
She ______ when I went to see her.
A.is reading B.have read C.was reading D.reads
My sister ______ in that school since she left school.
A.taught B.had taught C.teaches D.has taught
都选什么?为什么吖?

B他明天一回来,我就给他信息.
C当我去看他时,他正在读书.
D自从我姐姐毕业,她就一直在那所学校教书.(用现在完成时)