问题描述：
He won't change his mind ______ you go and try to persuade him yourself.
He won't change his mind ______ you go and try topersuade him yourself.
A．since B．until C．as if D．even if
为什么答案是D?not until
He won't change his mind ______ you go and try topersuade him yourself.
A．since B．until C．as if D．even if
为什么答案是D?not until
问题解答：
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