Either your parents or your grandfather __to attend the meeting tomorrow.
题目
Either your parents or your grandfather __to attend the meeting tomorrow.
A is
B are
C are going
D have
答案
选 A
be to do 将要去做某事
either ...or...后面的动词,要和or后面的名词一致.“就近原则”
翻译下,
你爸妈或是你爷爷明天将会参加会议.
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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