Question

---Where was your sister at this time yesterday evening ?
---She was writing an e-mail ______ I was watching TV at home.

A．after

B．as soon as

C．while

D．until

Answer 1

C

试题分析：after在……之后；as soon as 一……就……；while当……时，强调两个动作同时发生；until直到，常和not搭配使用。结合上文可知下文句意为：当我在家看电视时，她正在写电子邮件。故选C。
点评：解答此类题型首先要直到每个连词的基本用法，然后结合上下文关系选择合适连词，故平时加强阅读分析能力是很必要的。