As it turned out to be a problem of no importance, we ______ so much time looking into it.

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问题 As it turned out to be a problem of no importance, we ______ so much time looking into it.

选项 A、needn’t spend
B、didn’t have to spend
C、oughtn’t to spend
D、needn’t have spent

答案D

解析 本题考查的知识点有:(1)由as引导的非限制性定语从句,(2)隐含条件句。根据句意“证实”及其内容这一动作发生在现在,而“调查”发生在过去,说话人显然认为“调查”是没有必要的,但该动作已经发生了,所以说话人所表述的只是一种对于他/她而言很不情愿或无奈的事实,因此以过去完成时来表示对该过去动作(look into)的虚拟,注意情态动词的过去式(虚拟式)的表达方式。
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