whatever is worth doing at all is worth doing it well.为什么这里的it要省略?

问题描述:

whatever is worth doing at all is worth doing it well.为什么这里的it要省略?

it省略的原因:因为词组be worth doing的主语就是值得做的事情,所以该词组中doing不能接宾语.如:This book is worth reading.(后面不能加it).