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(2011年南京模拟)Peoplebegintoknowthatmostenvironmentalproblemsexistbecausenecessarymeasuresforpreventingthemtakeninthepast.A.arenotB.

题目详情

 (2011 年南京模拟 ) 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

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答案和解析
解析: 选 B 。考查动词的时态。句意:人们开始了解到由于在过去没有采取必要的预防措施从而造成了大多数的环境问题。 in the past 暗示出用过去时态; hadn ’ t been 指在一个过去的动作或时间之前发...