Though it sounds a bit expensive,it is worth ________ A.buying B.buying it

题目

Though it sounds a bit expensive,it is worth ________ A.buying B.buying it
请问B为什么不可以 不是有it is worth doing buying it中的it指前文提到的

答案

it is worth doing sth.中的it 就是指代前面的事物或者事件.这个句子中就是指代though it sounds a bit expengsive 中的it.所以无需再加it .