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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(wèn)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(yǔ)從句,可譯為"既然",相當(dāng)于"since,as等",主句為一個(gè)特殊疑問(wèn)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(wèn)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(yǔ)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(yǔ)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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