Where is he?He must还是must be on that island.选择题,是选 must 还是 must be.谢谢帮忙!

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Where is he?He must还是must be on that island.选择题,是选 must 还是 must be.谢谢帮忙!

Where is he?He must还是must be on that island.选择题,是选 must 还是 must be.谢谢帮忙!
Where is he?He must还是must be on that island.
选择题,是选 must 还是 must be.谢谢帮忙!

Where is he?He must还是must be on that island.选择题,是选 must 还是 must be.谢谢帮忙!
100% 选 must
He must be on that island.
【be】是be动词,这句话的谓语,是句子中必不可少的组成部分.
【must】是情态动词,用于表示句子的肯定程度,即使没有它,句子语法还是正确的.

must be...
must只是情态动词,不能单独作谓语。比如:He must be a teacher.

must be 因为on 是介词,must这儿指一定的意思,这儿要用be

must be

must be 是情态助词 不能单独使用 要放在动词前面

must be
每个句子都必须由动词 be就是那个动词