They must be back by 10:00p.m.at night(改为一般疑问句)( ) ( )( )( )by10:00p.m.at night?

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They must be back by 10:00p.m.at night(改为一般疑问句)( ) ( )( )( )by10:00p.m.at night?

They must be back by 10:00p.m.at night(改为一般疑问句)( ) ( )( )( )by10:00p.m.at night?
They must be back by 10:00p.m.at night(改为一般疑问句)
( ) ( )( )( )by10:00p.m.at night?

They must be back by 10:00p.m.at night(改为一般疑问句)( ) ( )( )( )by10:00p.m.at night?
正确答案:Must they be back by10:00p.m.at night?
解析:有情态动词就提前情态动词,因为主语是第三人称,所以主语不用变.这样讲明白吗?