问题详情:
In the 1950s in the USA, most families had just one phone at home, and wireless phones ____ yet.
A. haven’t invented B. haven’t been invented
C. hadn’t invented D. hadn’t been invented
【回答】
D
知识点:动词时态与语态
题型:选择题
问题详情:
In the 1950s in the USA, most families had just one phone at home, and wireless phones ____ yet.
A. haven’t invented B. haven’t been invented
C. hadn’t invented D. hadn’t been invented
【回答】
D
知识点:动词时态与语态
题型:选择题