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1．-Mom，can I go to the zoo with Linda？-Sorry，you can't____ you haven't fully recovered from your flu．（　�。�
A．untilB．beforeC．asD．unless

分析 --媽媽?zhuān)铱梢院蚅inda去動(dòng)物園嗎？
--抱歉，你不能去，因?yàn)槟愕母忻斑�沒(méi)有完全康復(fù)．

解答 答案：C．根據(jù)you haven't fully recovered from your flu可知由于你的感冒還沒(méi)有完全康復(fù)，所以你不能去，兩句之間是因果關(guān)系，所以答案是C as"因?yàn)?．其他選項(xiàng)的含義分別是A"直到"；B"在…之前"；D"除非"．

點(diǎn)評(píng) 考查從屬連詞． as用作連詞引導(dǎo)原因狀語(yǔ)從句
　　as，because，since都可以表示因果關(guān)系，連接原因狀語(yǔ)從句，含義是"因?yàn)椋捎?，但它們有區(qū)別：because表示的語(yǔ)氣最強(qiáng)；as一般放在句首，語(yǔ)氣較弱，較口語(yǔ)化；since常常用在書(shū)面語(yǔ)中，表示多為對(duì)方已知的、或稍加分析便可得知的原因，有時(shí)可譯作"既然"．例如：
　�。�1）He will succeed because he is in earnest．他一定會(huì)成功，因?yàn)樗苷J(rèn)真．
　�。�2）Since you are so sure of it he"ll believe you．既然你對(duì)此如此有把握，他會(huì)相信你的．
　　（3）As rain has fallen，the air is cooler．因?yàn)橄逻^(guò)雨，空氣比較清爽．

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