It has been announced thatcandidates_remain in their seats until all the papersb have been collecte
问题描述：
It has been announced thatcandidates_remain in their seats until all the papersb have been collecte
a.can b.will c.may d.shall
答
d,这里有强制命令的意思,
[用于陈述句第二、三人称,表示说话者的意图、警告、命令、决心等,主语的行动受讲话者支配] 必须,应,可
He shall go.
他可以去.
You shall have an answer by tomorrow.
到明天你可以得到答复.
He shall have a bicycle for his birthday.
他可以得到一架自行车作为生日礼物.
She shall not enter my house again.
她不得再进我家.