the old couple have been married for 40years and never once ( )with each other .A they had quarrel
题目
the old couple have been married for 40years and never once ( )with each other .A they had quarrel
the old couple have been married for 40years and never once ( )with each other
.A they had quarreled
B they have quarreled
C have they quarreled
D had they quarreled .
答案
C,这个前面是never.否定词句首要用倒装,所以排除A,B.这个题是说这对老夫妻从没吵过架,所以用现在完成时,一直到现在.所以选C
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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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