2. 外语
  3. Most environmental problems exist because adequate measures for preventing them______ taken in the past.

Most environmental problems exist because adequate measures for preventing them______ taken in the past.

admin2012-06-19  52
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:https://www.kaotiyun.com/show/UymK777K
0

专业英语四级

相关试题推荐
随机试题
最新回复(0)