He did ___until it was midnight

He did ___until it was midnight
A.a problem after a problem B.problem after prolems
C.a problem after problem D.problem after problem
英语人气:481 ℃时间:2020-01-28 18:15:55
优质解答
我觉得应该是A
觉得题目应该是想说一道接着一道的做下去,直到半夜.
我来回答
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