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

admin2009-08-21  62

问题 Most environmental problems exist because adequate measures for preventing them ______  taken in the past.

选项 A、was not
B、were not being
C、were not
D、was no to be

答案C

解析 句中有in the past,故用一般过去时态。从句主语为复数,故选C项。
转载请注明原文地址:https://kaotiyun.com/show/DuSC777K
本试题收录于: 英语题库成考专升本分类
0

最新回复(0)