We collected a lot of books to get the necessary information but only half helpful, so we failed to finish the work. A．is B．areC．wasD．were 题目和参考答案——青夏教育精英家教网—

题目内容

We collected a lot of books to get the necessary information but only half _________helpful, so we failed to finish the work.

A．is

B．are

C．was

D．were

考查主谓一致.句意:我收集了许多书以获得必要的信息,但是只有一半有帮助,因此我们未能按时完成工作.根据上下文可知谓语动词用过去时态,复数的一半还是复数,故用are的过去时态were,选D.

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