Jack wasn't allowed to go into the sports club he left his membership card at home.
A. though
B. as
C. before
D. Until
网友回答
A. though
(答案→)B. as
C. before
D. Until
解析：考查状语从句连接词。句意：杰克不被允许进入体育俱乐部，因为他把会员卡忘在家里了。A尽管；表让步；B因为；表原因；C在......之前；指时间；D直到；指时间。故想B。