题目列表(包括答案和解析)
Only after he had spent several nights working on the maths problem ________to wonder whether the problem was wrongly set.
A．he began B．that he began
C．he did begin D．did he begin
Only after he had spent several nights working on the maths problem_______to wonder whether the problem was wrongly set.
A did he begin B, he began C, he did begin D, began he
Only after he had spent several nights working on the maths problem to wonder whether the problem was wrongly set．
A．did he begin B．he began C．he did begin D．began he
Only after he had spent several nights working on the maths problem to wonder whether the problem was wrongly set．
A．did he begin B．he began C．he did begin D．began he
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