-She looks very happy .She___have passed the exam.-Iguess so.It's not difficult after allA.shouldB.couldC.mustD.might要解释为什么...

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-She looks very happy .She___have passed the exam.-Iguess so.It's not difficult after allA.shouldB.couldC.mustD.might要解释为什么...
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-She looks very happy .She___have passed the exam.-Iguess so.It's not difficult after allA.shouldB.couldC.mustD.might要解释为什么...
-She looks very happy .She___have passed the exam.
-Iguess so.It's not difficult after all
A.should
B.could
C.must
D.might
要解释为什么...

-She looks very happy .She___have passed the exam.-Iguess so.It's not difficult after allA.shouldB.couldC.mustD.might要解释为什么...
c must have done 对过去事实最有把握的肯定推测
句中有提示"她看上去很开心"和"考试根本不难"说明说话者对这一事实的肯定态度.

C.must
must have done是对对方一个较为肯定的猜测1

A should有一种用法表示肯定推测。

C,这种句子都是这么选的,就是为了表示说这个话的人很肯定的猜测。