---- Mary,how did your Math test go ---- I had thought I ___

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---- Mary,how did your Math test go ---- I had thought I ______,but in fact I came in the top 10
A.should have failed B.could have failed C.might have failed D.need have failed
为什么选c 不选b

用于表示推测不确定情况的情态动词有4个：
must 表示十分有把握的肯定推测.
can 表示推测时,只用于否定句,表示十分有把握的否定推测.
should 表示根据科学理论进行推测.
may 表示没有把握的推测.
所以上题C正确,could not have failed 和 must have failed 都是正确的,但意思不同. 又因为后面说他实际上及格了,所以用may是最好的,因为他的推测并不正确.

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