he was not rich enough to buy whatever he wanted Edison decided to make his new laborato

问题补充：

he was not rich enough to buy whatever he wanted, Edison decided to make his new laboratory the best.

A. Although

B. Since

C. When

D. As

答案：

(答案→)A. Although

B. Since

C. When

D. As

解析：连词辨析。Although虽然，尽管；Since因为，由于；When当……时候；As

虽然，尽管。句子前后表让步关系，排除B,C；as引导让步状语从句，句子需要倒装，而原句的正常语序，所以排除D；选A。