Test takers _______ remain in their seats until all the exam papers have been collected.?
A．canB．could　?
C．shallD．would?
C?
shall作情態(tài)動(dòng)詞用于第二、三人稱時(shí)，表示“許可、允諾、命令、強(qiáng)制”，shall在該句中表“強(qiáng)制”。
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