Question

【题目】My brother was reading a book I came in.

A. because B. since C. as D. though

Answer 1

【答案】C

【解析】

句意：当我进来的时候我的弟弟正在读书。A. because因为； B. since自从，既然； C. as 当……时候； D. though虽然，尽管。若从句是一个短暂性动作（如：came），主句是一个持续性动作（如：was reading a book），可用 as / when 但不用 while：It was raining hard when [as] we arrived. 我们到达时正下着大雨。故选C。