高考踩坑的英语题, 只因不清楚doing和to do的具体用
这是一道高考选择题。99%同学都栽在了这道题目上。我们来一起来回顾题目:He was busy writing a story only____once in a while to smoke a cigarette. 这个选项如下: A. To stop B. Stopping C. to have stopped D. having stopped 这4个选项哪个才是正确答案呢?咱们先卖个关子。咱们先来看看这个句子的结构。整个句子主干是 "He was busy writing a sto...