Students  ______ remain in their seats until all the exam papers have been collected.
A．mustB．shallC．mayD．can
B
考查情態(tài)動(dòng)詞shall的用法。Shall用于二三人稱時(shí)表示一種語(yǔ)氣，如命令、允諾、規(guī)定、警告等等。句意：學(xué)生們要保持坐在自己的座位上直到所有的試卷被收齊。Shall在這里表示一種規(guī)定。所以選B。
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