Most environmental problems exist because adequate measures for preventing them_

游客2023-11-15 44

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、being not

答案 B

解析被动语态的时态、数、性的一致，主要由助动词来表示，要注意它们与主语的一致。此处从句的主语measures是复数，因此选择答案B。

转载请注明原文地址:http://tihaiku.com/zcyy/3190594.html

相关试题推荐

随机试题

最新回复(0)

Becauseoftheeconomiccrisis,industrialoutputintheregionremained______.A