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两道英语题（有关情态动词的）Black holes _____ not be seen directly,so dete

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两道英语题（有关情态动词的）Black holes _____ not be seen directly,so determining the number of t
1）Black holes _____ not be seen directly,so determining the number of them is a tough task.
A.can
B.should
C.must have
D.need
2）How _____ you say that you really understand the whole story if you have cover only part of the article?
A.can
B.must
C.need
D.may
选哪个?说明一下有没有can have done&should have done&must have done&may have done?
两道英语题（有关情态动词的）Black holes _____ not be seen directly,so dete
1）A 黑洞不能被直接看到,所以确定它们的数量是件艰难的事情
2）A 如果你只是看过文章的一部分,你怎么能说你就真的理解了全文呢?!
没有can have done,有couldn't have done：xxx不可能做了某事
有should/shouldn't have done：xxx本该/不该做某事,却做了/没做某事
有must have done：xxx一定做了某事（对过去肯定的推测）
有may have done：xxx可能做了某事（对过去可能性的推测）
两道英语题（有关情态动词的）Black holes _____ not be seen directly,so dete 关于情态动词的用法You _____ be tired; you have been working for so lo 两道英语情态动词的题Where__that noise be coming fromA.could B.may C.mu So +be动词、助动词、情态动词+主语 的用法 有关情态动词表示推测can not be 和might not be 有什么区别?具体讲讲情态动词表推测的用法! so+be动词/情态动词/助动词+主语 与情态动词有关的英语题目 英语有关情态动词的问题, 情态动词有关的英语题目 一道有关情态动词的英语选择题 情态动词的一道语法题It's wonderful that you _____ have achieved so muc 高一英语题（有关情态动词）