We needn't have taken warm sweaters. We _______ the space in our luggage for more books
问题描述：
We needn't have taken warm sweaters. We _______ the space in our luggage for more books
a. can have usedb. could have usedc. ought to use
d. may have done
为什么选b 不选C, 高手们帮一下忙把,谢谢了!
答
你可以通过语境判断阿 前面那句话说得是we needn't have taken,是现在完成时态,后面的话首先时态就要对应,要用have done形式.而且C选项是虚拟语气,表示即将发生的事,时态明显对不上.还有你要准确的理解句子本身的意思.