题目内容
33.Only after he had spent several nights working on the math problem_______to wonder whether the problem was wrongly set.
A.did he begin | B.he began | C.he did begin | D.began he |
A
解析

练习册系列答案
相关题目
Only after they had discussed the matter for several hours ______a decision.
A.they reached |
B.did they reach |
C.they reach |
D.do they reach |
Only after he took off his sunglasses ______ him as one of my favourite movie stars.
A.I recognized |
B.I didn’t recognise |
C.did I recognize |
D.had I recognized |