3.(2011·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
解析: 句意为: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生的事情;wouldn’t be 表过去将来,故B项正确。
答案: B
4.(2011·日照市调研考试)—Monitor?
—I’m not monitor of our class.I________with the teacher until the monitor is elected.
A.will just help
B.am just to help
C.am just helping
D.have just helped
解析: 考查时态。下句意为:我只是在帮助老师,直到选出班长为止。根据上下句语意可知,此处用现在进行时,表示答话者当时所处的状态。
答案: C
5.(2011·南京第一次模拟)—I hear you________at Smith’s.
—Yes,I________there for about three months.
A.work;had been working
B.worked;was working
C.are working;have been working
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