Most environmental problems exist because adequate measures for preventing them_

游客2023-11-06 66

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:https://tihaiku.com/zcyy/3162185.html

相关试题推荐

随机试题

最新回复(0)

Theoilmustbeusedup,______thelightwentout.A、sinceB、asC、becauseD、for