一道关于动词时态的英语题,详情见内~

题目

一道关于动词时态的英语题,详情见内~
My sisiter has just arrived here,but in fact I didn't know until this morning she ____________to see me
A.will come
B.was coming
C.came
D.had been coming

答案

this morning 表示的就是过去式,而until是一直到什么时候
所以要用过去进行时.
用been doing sth.
懂了吗