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：要不是因為你的幫助，我們過去不可能及時完成如此重的任務(wù)．

解答 答案B．
A項"不管，不顧"；C項"多虧了，由于"；D項"關(guān)于"；B項"要不是因為，如果因為"；由"we could not have finished such hard work in time"可知，與過去事實相反，是虛擬語氣．主句謂語用"would/could/should/might+動詞；從句用"had+done"．"but for"可引導(dǎo)的含蓄虛擬語氣，"But for your help"可轉(zhuǎn)換成"If it hadn't been for your help"．因此B項符合語境，故選B．

點評 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表達的，而是隱藏在上下文中或由with、without、otherwise、or、but for等詞來暗示，相當于if引導(dǎo)的虛擬條件句．所以解題時要注意上下文的語境和這些關(guān)鍵詞的提示．

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