一道高中语法填空题
问题描述：
一道高中语法填空题
These qualities help people achieve their goals because they will not give up so easily when ____ （face）difficulties.
答案是facing 我怎么知道是填ing形式还是原型呢?好像我填语法填空时经常错这种类型的,该怎么查漏补缺?
答
they will not give up so easily when ____ （face）difficulties.这句话的整句应该是：they will not give up so easily when they are facing difficulties其中的they are 是可以省略的.这个东西在语法中什么还真...