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In order to get enough evidence,we ( ) for information in th

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In order to get enough evidence,we ( ) for information in the library for a month and
In order to get enough evidence,we ( ) for information in the library for a month and i am afraid another week is still needed.
A.have been looking B.are looking C .would look D.looked
In order to get enough evidence,we ( ) for information in th
选A
由后半句说的 恐怕需要另外一周的时间
我们可以推断这一个月来他们一直在搜集证据,所以用现在完成进行时时态.
再问: 那为什么要被动呢?
再答: 这不是被动, have been doing 是个固定句型,意思是 一直在做某事。 比如, I have been reading books for 2 hours. 我已经看了两个小时的书了。 这个句型用于维持到说话时候还没停止的动作。