They didn't go home ______they finished their work.( )
A.because B.where C.until D.while
C
【分析】他们直到完成工作才回家.
【解答】because因为,引导原因状语从句;where何地,引导地点状语从句;until直到,引导时间状语从句;while当……时候,引导时间状语从句.根据They didn't go home可知,空处需用从属连词until引导时间状语从句,not…until直到……才…….
【点评】先熟悉所给选项的从属连词词义,再结合题干和句意选择正确的从属连词.本题需注意从属连词although引导让步状语从句的用法.