We _____ at the house as we ______ of buying it.
A. looked: were thinking
B. were looking; were thinking
C. were looking; thought
D. looked; had thought
本题正确答案是 B，请问老师 as 在本句中是不是翻译成“当……的时候”，在我印象中，while 后面要用进行时，as 之后也需要如此用吗？做此类题是通过语法剖析呢，还是通过翻译来做呢？请老师说说为何其他选项不可以。谢谢老师！
你说正确答案是 B，我在百度上搜了一下这道题，这道题在网上至少出目前数十个地方，所给答案几乎都是 B，其有关分析基本上是将 as剖析为表示时间的连词，意思是当的时候。但我对这道题有不同怎么看。我感觉这道题的A和B均可选。同时我觉得，此句中的 as 不是表示时间，而是表示缘由。
1. 若选A，可以假设是如此的语境：
What did you do this morning? 你们上午干什么了？
We looked at the house as we were thinking of buying it. 大家去看了房屋，由于大家计划要买下它。
2. 若选 B，可以假设是如此的语境：
What were you doing then? 那时你们在干什么？
We were looking at the house as we were thinking of buying it. 大家正在看房屋，由于大家计划要买下它。
【补充】做此类题应该注意两点：一要使句子符合语法需要，二要使句子意思要通顺（要合情理、合逻辑）。
