--Haven't you seen Mr. Wilson at the lec
题型:选择题
问题:
--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
--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