______ at Harvard, he began to w

______ at Harvard, he began to write his essay.
A、Busy was as he
B、Busy as was he
C、Busy as he was
D、As was he busy
【正确答案】：C
【题目解析】：本句考查让步状语从句的用法。as引导让步状语从句时，句子部分倒装。如：Young as he is，he knows a lot of things．虽然他年龄不大，可知道的事情很多。本句意思是：“虽然他在哈佛大学很忙，但他又开始写作了。”