18．_________ your help，we could not have finished such hard work in time．（　�。�
A．In spite ofB．But forC．Thanks toD．As for

分析 句意：要不是因?yàn)槟愕膸椭�，我們過(guò)去不可能及時(shí)完成如此重的任務(wù)．

解答 答案B．
A項(xiàng)"不管，不顧"；C項(xiàng)"多虧了，由于"；D項(xiàng)"關(guān)于"；B項(xiàng)"要不是因?yàn)�，如果因�(yàn)?；由"we could not have finished such hard work in time"可知，與過(guò)去事實(shí)相反，是虛擬語(yǔ)氣．主句謂語(yǔ)用"would/could/should/might+動(dòng)詞；從句用"had+done"．"but for"可引導(dǎo)的含蓄虛擬語(yǔ)氣，"But for your help"可轉(zhuǎn)換成"If it hadn't been for your help"．因此B項(xiàng)符合語(yǔ)境，故選B．

點(diǎn)評(píng) 此題考查含蓄虛擬條件句．含蓄虛擬條件句中的假設(shè)條件不是以條件從句的形式來(lái)表達(dá)的，而是隱藏在上下文中或由with、without、otherwise、or、but for等詞來(lái)暗示，相當(dāng)于if引導(dǎo)的虛擬條件句．所以解題時(shí)要注意上下文的語(yǔ)境和這些關(guān)鍵詞的提示．

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