问题补充：
单选题Onlyafterspendingseveralnightsworkingonthemathproblemtowonderwhethertheproblemwaswronglyset.A.had he begunB.he beganC.did he beginD.began he
答案：
C
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时间：2022-11-27 22:05:12
单选题Onlyafterspendingseveralnightsworkingonthemathproblemtowonderwhethertheproblemwaswronglyset.A.had he begunB.he beganC.did he beginD.began he
C
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