________ 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
B
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(gè)簡(jiǎn)單句，為現(xiàn)在分詞短語(yǔ)作讓步狀語(yǔ)。
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