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一个英语选择题.His brother worked out ___until it was twelve.A.prob

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一个英语选择题.
His brother worked out ___until it was twelve.
A.problem after problem B.problem by problems
C.a problem after a problem D.a problem by a problem
还有,.
problem after problem 是什么用法.
我知道答案是这个,但这是什么用法,如:hour after hour
是“名词+介词+名词”的用法,就是“一个问题接着一个问题”的意思.
hour after hour是“一个小时接着一个小时的”意思,同理,day after day 是“一天又一天”的意思.