题目内容：

A lot of children (have to)learn this or that on the weekens,though they hate doing it.
为什么要有have to?
has to

优质解答

当然不行了,children是个复数概念的名词,其后面要跟复数形式的动词,即have,倘若是单数名词,才用形式的has,比如,The child has to learn this or that on the weekends,though he or she(也是单数) hates(同样跟单数...