4．Why do you turn to me for help_____ you can easily work out the problem independently？（　　）
A．untilB．whenC．afterD．unless

分析 既然你自己能夠很容易地解出這個(gè)問題，為什么還要求助于我呢？

解答 答案：B 本句中when在引導(dǎo)時(shí)間狀語從句，可譯為"既然"，相當(dāng)于"since，as等"，主句為一個(gè)特殊疑問句"你為什么向我求助呢？"而從句的意思是"你自己就可以很容易地解出這個(gè)問題"，可知使用when可以使句子前后合乎邏輯，故答案為A．其余三個(gè)選項(xiàng)在引導(dǎo)狀語從句時(shí)意思常為：until"直到"，after"在…之后"，unless"除非"，用在本句中都不合句意，排除．

點(diǎn)評(píng) 解含有狀語從句的復(fù)合句時(shí)，關(guān)鍵是弄清主從句的關(guān)系，然后根據(jù)句意選擇合適的連詞．

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