Most environmental problems exist because adequate measures for preventing them_

游客2024-09-27 48

问题 Most environmental problems exist because adequate measures for preventing them______taken in the past.

选项 A、was not
B、were not
C、were not being
D、had not been

答案 B

解析

转载请注明原文地址:http://tihaiku.com/zcyy/3776749.html

相关试题推荐

随机试题

最新回复(0)

Accordingtotheconversation,thedayisspecialbecause[originaltext]M:Hello