It has been announced that candidates ( 候选人)remain in their seats until all the papers has

发布时间：2020-08-17 13:20:51

It has been announced that candidates ( 候选人)    remain in their seats until all the papers has  been  collected .   
A. can
B. will
C. may
D. shall

网友回答

A. can
B. will
C. may
(答案→)D. shall
解析：这里的shall表示一种命令；有必须、必将的意思。
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