33.Only after he had spent several nights working on the math problem_______to wonder whether the pr

题目简介

33.Only after he had spent several nights working on the math problem_______to wonder whether the pr

题目详情


33.Only after he had spent several nights working on the math problem_______to wonder whether the problem was wrongly set.    
A.did he beginB.he beganC.he did beginD.began he
题型:单选题难度:偏易来源:不详

答案

A

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