It is written clearly in the requirements that all passenger

It is written clearly in the requirements that all passengers _______ check onto board thirty minutes before the plane takes off.
A.may B.can C.will D.shall
zhangzhigang888 1年前 已收到1个回答 举报

胡宝 幼苗

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D

shall作为情态动词,用于第二,三人称中表示许诺,警告,命令的意思。

1年前

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