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。