12．      your timely help，otherwise，we wouldn't have finished the work ahead of time．（　�。�
A．BecauseB．ForC．Thanks toD．Thanks of

分析 多虧了你及時的幫忙，否則我們不可能提前完成工作．

解答 答案：C  because 因為；for 因為； thanks to 幸虧、多虧；thanks of 謝謝．選項A和B都意為"因為"，后面均跟從句，引導(dǎo)原因狀語從句，而句中your timely help為名詞，因此排除該2項．C選項和D選項均可以表達(dá)感謝之意，但根據(jù)后半句的虛擬語氣的使用，可排除D，D選項是客觀的對他人進(jìn)行感謝，而C選項此處可引導(dǎo)特殊虛擬語氣，符合句意，故選C．

點評 本題考查介詞短語的語義辨析，考生在平時的學(xué)習(xí)中應(yīng)注意積累相應(yīng)的短語和詞匯，并牢記其意思．在做題時，將短語的意思和題干相結(jié)合，從語法、句子結(jié)構(gòu)尤其是句意上去判斷，句意通順，符合邏輯，即正確答案．

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