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________ several timesbut he still doesn't know how to do it correctly.

AAlthough I've taught him

BI've taught him

CHaving been taught

DHaving taught

 

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。

 

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