【急】SAT上的一道题,求牛人指导.
问题描述：
【急】SAT上的一道题,求牛人指导.
求牛人指导：The bactrian camel is welladapted to the extreme climate of its native *,having thick fur tand underwool that 【keeps】 it warm in winter and also insulate against summer heat.这个里面的keeps为什么错?
答
就看keeps it warm in winter and also insulate against summer heat这段
有and说明是平行结构,那么and前面连接的东西时态跟结构都要一致,那么and后面的动词是insulate,并没有加s,所以前面的keep也不用加s