It has been announced that students _______ remain in their seats until all the
题型：不详难度：来源：
| It has been announced that students _______ remain in their seats until all the papers have been collected. |
答案
| D |
解析
| 本题考查情态动词在这句话中，正确的句意应该为：学生必须留在座位上，直到所有的试卷都被收完为止。shall用作情态动词时，主语可以为第二或者第三人称，表示说话者对主语的命令、要求或者承诺等等，最符合本句的意思。而may/ can表允许；will表意愿，均不符合题意，故排除。 |
举一反三
----- Mary looks very upset. She _______ failed to pass the exam.
----- I guess so. It"s very difficult after all.
A must have B could have C should have D might have |
He _____ be really difficult at times even though he ,generally speaking, is a nice person.| A．can | B．should | C．shall | D．must |
|
My brother is honest. He _____ such a thing.| A．might not do | B．can’t have done | C．can do | D．mustn’t have done |
|
-----Who ______ it be that hasn’t handed it in yesterday?
------It _______ be Bob. He handed it in yesterday.| A．can; mustn’t | B．must; can | C．can; can’t | D．may; mustn’t |
|
| The boy be very naughty, but he is very lovely. |
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