It has been announced that passengers remain in their seats until the dangerous subjects

发布时间：2020-08-17 12:32:18

It has been announced that passengers      remain in their seats until the dangerous subjects have been removed.
A. can
B. will
C. may
D. shall

网友回答

A. can
B. will
C. may
(答案→)D. shall
解析：shall在此表示“命令、警告，强制”淡之意。
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