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单选题
21.You didn＇ t take his advice. his advice, yousuch a mistake.
A
A. Had you taken； wouldn＇t have made
B
B. If you had taken； would make
C
C. Were you to take； shouldn＇t have made
D
D. Have you taken； won＇t have made
答案解析
正确答案：A
解析：
21.【翻译】 你没有听从他的建议.如果你听取了他的建议，你就不会犯这样的错误了【精析】A分析句子结构并结合选项可知，第二句含有一个省略If的非真实条件句。根据句意和第一句中的 didn＇t take可知，第二句是与过去事实相反的假设，从句谓语动词应用“had +过去分词”的形式，主句谓语动词应用 *"should/would/could/might have +过去分词”的形式。当if引导的非真实条件句中含有were, had或should fl寸，可以 省略if,并把这些词提至句首，以强调条件的虚拟性或突出说话人的主观愿望 故选A。
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