By the time he back last night, we had got 200 pictures of the Chang'e-3 lunar probe.
A. came
B. had e
C. was ing
D. would e
网友回答
(答案→)A. came
B. had e
C. was ing
D. would e
解析：句意：到他昨晚回来的时候为止，我们已经得到200张嫦娥三号月球探测器的照片了。By the time引导的是时间状语从句，时间是last night，所以用一般过去式，但是主句应该是过去完成时，选A。