16、He has hurt her, so she won't forgive him _____ he makes an apology to her.

    A．a(chǎn)lthough          B．once             C．if                 D．unless

16、D

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He has hurt her, so she won't forgive him _____ he makes an apology to her.

    A．a(chǎn)lthough          B．once             C．if                 D．unless

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