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外语
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.
admin
2014-09-18
64
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
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0
专业英语四级
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