C.to have been D.that it is
解析: 考查非谓语动词。“sb./sth.+be+reported/said/believed/thought etc.+to do sth.(=It is/was+reported/said/believed/thought etc.+that...)”为常用句式,由此可排除A和D选项。且根据题干中的时间状语“over the past few months”可知,空格处应该使用不定式的完成式。
答案: C
3.(2017·安徽江南十校摸底)Global warming is having a great effect on hundreds of plant and animal species around the world,________some living patterns,scientists say.
A.changes B.changed
C.changing D.change
解析: 考查非谓语动词。句意为:科学家们说,全球变暖正在影响着数百种的动植物并且改变了它们的一些生活方式。此处changing some living patterns作伴随状语。
答案: C
4.(2017·鹰潭市二模)All the task________ahead of time,they decided to go on holiday for a week.
A.had been finished B.having been finished
C.were finished D.having finished
解析: 考查独立主格结构。句意为:所有的工作都已提前完成,他们决定去度假一周。本题为独立主格结构,task为finish的逻辑主语。句式分析:逗号后面为一完整句子,两句话之间没有任何连词,因此前面不能再为句子,故首先可排除A、C两项,又因为task与finish之间为被动关系,因此可排除D项。
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