【题目】_______ he met with the difficulty did he realize the importance of our help.
A. Never until B. Even though
C. Until when D. Ever since
在线课程【答案】A
【解析】
试题分析：考查从句的引导词。A. Never until直到；B. Even though 即使；C. Until when 直到……时候；D. Ever since自从；根据主句是倒装did he realize可以排除B、C，D两项，故选A项。
考点 : 考查从句的引导词