Question

【题目】Why do you turn to me for help ______ you can easily work out the problem independently?

A. until B. when

C. after D. unless

Answer 1

【答案】B

【解析】考查连词辨析。句意：既然你能独立解决这个难题，为什么你向我求助呢？A. until 直到……；B. when考虑到；既然；当……时；C. after在……之后；D. unless除非，如果不。B项符合语境。