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It has been announced that students _______ remain in their seats until all the papers have been collected.
A.can B.mayC.willD.shall
D
本題考查情態(tài)動詞在這句話中,正確的句意應該為:學生必須留在座位上,直到所有的試卷都被收完為止。shall用作情態(tài)動詞時,主語可以為第二或者第三人稱,表示說話者對主語的命令、要求或者承諾等等,最符合本句的意思。而may/ can表允許;will表意愿,均不符合題意,故排除。
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