28. I _____ this for over 30 years before I retired in 2020.(A) have did (B) had doing (C) have done

問題詳情

28. I _____ this for over 30 years before I retired in 2020.
(A) have did
(B) had doing
(C) have done
(D) had been doing

參考答案

答案：D
難度：簡單0.606
書單：沒有書單，新增

用户評論

【陸玖】評論

已經在2020退休可知直到過去以前........

上一篇 : 27. The two students _____ by the teacher will enroll in the contest next month.(A) will be choosed
下一篇 : 29. The rumor _____ my father has a mistress really bothers me.(A) that (B) which (C) who (D) whom