摘要：33．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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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
查看习题详情和答案>>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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