________ several times，but he still doesn"t know how to do it correctly.A．Althou
题型：不详难度：来源：
________ several times，but he still doesn"t know how to do it correctly.| A．Although I"ve taught him | | B．I"ve taught him | | C．Having been taught | | D．Having taught |
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答案
| B |
解析
| although不能与but连用，故不能选择A。若选C，必须把并列连词but去掉，这样就变成了一个简单句，为现在分词短语作让步状语。 |
举一反三
| ________ seems to be a strong competition in China for senior high students to enter universities does exist in other countries as well. |
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| The shocking news made me realize ________ terrible problems we would face.(2011·北京) |
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