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.

admin2014-09-18  45
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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