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            • 1．
              People begin to know that most environmental problems exist because necessary measures for preventing them _____ taken in the past.

              A. are not
              B. were not
              C. hadn't been
              D. wouldn't be
              难度：较易
              解析 收藏 试题篮
            • 2．
              After the argument, he spoke with the department manager and the problem _____. 

              A. solving
              B. had been solved
              C. was solved
              D. solved
              难度：较易
              解析 收藏 试题篮
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