A-A+

A new material ______ we have good reason to

2022-08-06 16:46:51 问答库阅读 180 次

问题详情

A new material ______ , we have good reason to be optimistic.
A．developed
B．being developed
C．was being developed
D．was developed请帮忙给出正确答案和分析，谢谢！

正确答案：B
解析：本句话考查的是独立主格的用法。