A.
我不知道他们什么时候动身去的北京.
过去时了.主句都是过去时.
I didn't know when they （ ） for beijing
I didn't know when they （ ） for beijing
A.left
B.leave
C.are leaving
D.were leaving
A.left
B.leave
C.are leaving
D.were leaving
英语人气：799 ℃时间：2019-12-23 12:45:44
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