It has been announced that all the candidates___remain in their seats until all the papers have been
题目
It has been announced that all the candidates___remain in their seats until all the papers have been collected.
A. shall B. should
为啥选A? 求区分这两个.→_→
答案
A
shall 和类似 all the candidates这样的三人称连用,带有强制意味,没有商榷余地,如条例,规章等的要求
should 表示主观上认为应该怎么做
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
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