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精英家教網 > 高中英語 > 題目詳情

________ 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

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，為現在分詞短語作讓步狀語。

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