Question

【题目】She had just finished her homework __________ her mother asked her to practise playing the piano yesterday.

A. when

B. while

C. after

D. since

Answer 1

【答案】A

【解析】句意：昨天她刚做完作业她妈妈就让她练习弹钢琴。when在本句中作并列连词，意为：and at that time。while作并列连词，表示对比，意为“而”；aftef为从属连词或介词，意为“在……之后”；since“自从……时候，既然……”。