Question

【题目】One Friday, we were packing to leave for a weekend away ________ my daughter heard cries for help.

A. after B. while C. since D. when

Answer 1

【答案】D

【解析】考查连词。句意：一个星期五，当我们正在收拾行装准备外出过周末时，我女儿突然听见求救声。when可以表示“正在这时/那时”，当一个动作（packing）发生时，另一个动作突然发生。表示时间的when后面跟不延续性动词(heard)。While后面接连续性动词。Since自从，after在…后面。选D。