2. 外语
  3. Most environmental problems exist because adequate measures for preventing them______ in the past.

Most environmental problems exist because adequate measures for preventing them______ in the past.

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问题 Most environmental problems exist because adequate measures for preventing them______ in the past.
选项 A、was not taken
B、were not taken
C、didn’t take
D、haven’t taken
答案B
解析
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