Question

Two years ago I broke my arm ____ football.

A．when playing

B．while played

C．played

D．having played

Answer 1

A

试题分析：整个句子已经有谓语动词broke，再出现谓语动词必须用连词，when 后的句子补充完整应是：when I was playing；因为I与play是主动关系，所以排除B，故选A。
点评：本题难度适中。为了使话说得简明扼要，英语句子中某个单词、短语甚至从句或主句都可以省去。这种省去句子某些成分而保持句子意思不变的现象，称为省略。它是高中阶段的重要的语法项目，需要考生仔细分析句子结构，来确定省略的内容。
即学即练：____ breakfast, he heard the doorbell ring.
A. When eat    B. While eating C. Eat     D. Having eaten
解析：B。句意：当他吃早饭时，他听见了门铃响。