问题详情:
Mobile phones are not so expensive as they ___________ to be.
A. are used B. were used C. use D. used
【回答】
D
知识点:动词时态
题型:选择题
问题详情:
Mobile phones are not so expensive as they ___________ to be.
A. are used B. were used C. use D. used
【回答】
D
知识点:动词时态
题型:选择题