______at Harvard, he began to write his essay.
【正确答案】 C
【答案解析】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)。所以答案选C。