问题补充:
单选题Onlyafterhehadspentseveralnightsworkingonthemathproblem_______towonderwhethertheproblemwaswronglyset.A.that he beganB.did he beginC.then he beganD.so that he began
答案:
B
时间:2019-05-20 21:42:32
单选题Onlyafterhehadspentseveralnightsworkingonthemathproblem_______towonderwhethertheproblemwaswronglyset.A.that he beganB.did he beginC.then he beganD.so that he began
B