--Havent you seen Mr. Wilson at the lecture?--Yes, but he had left I could ask him any q

发布时间：2020-08-21 00:42:28

--Haven't you seen Mr. Wilson at the lecture?
--Yes, but he had left      I could ask him any questions.
A. when
B. before
C. after
D. as

网友回答

A. when
(答案→)B. before
C. after
D. as
解析：此题考察的是过去完成时，had +动词的过去分词，表示发生在过去的过去的事情。
以上问题属网友观点，不代表本站立场，仅供参考！