By the time he _____ back last night, we had got 200 pictures of the Chang'e-3 lunar probe.
A.came | B.had come | C.was coming | D.would come |
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By the time he _____ back last night, we had got 200 pictures of the Chang'e-3 lunar probe.
A.came | B.had come | C.was coming | D.would come |