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

A. until B. when

C. after D. unless

【答案】B

【解析】考查連詞辨析。句意：既然你能獨(dú)立解決這個(gè)難題，為什么你向我求助呢？A. until 直到……；B. when考慮到；既然；當(dāng)……時(shí)；C. after在……之后；D. unless除非，如果不。B項(xiàng)符合語(yǔ)境。

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