2. 专升本
  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.

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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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