________ several times,but 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不能與but連用,故不能選擇A。若選C,必須把并列連詞but去掉,這樣就變成了一個簡單句,為現(xiàn)在分詞短語作讓步狀語。

 

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