问题
选择题
____ 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
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。