(2)(2006辽宁高考,24) He was about halfway through his meal________ a familiar voice came his ears.
A.why B.where C.when D.while
提示:"他大约吃饭进行到一半,这时他听到一个熟悉的声音。"以上四个词中只有when,while能表示时间,但当"这时"讲时,只能用when。
答案:C