题目内容
— Alice, you look puzzled. Have you understood it?
— Yes, I _____ another problem just now.
— Yes, I _____ another problem just now.
[ ]
A. have thought of
B. thought of
C. was thinking of
D. had thought of
B. thought of
C. was thinking of
D. had thought of
C
练习册系列答案
相关题目