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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
2017-07-18
70
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、being not
答案
C
解析
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本试题收录于:
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