问题描述：
．—Have your parents allowed you ______ his letter? —Not yet. A．replying B．to reply
．—Have your parents allowed you ______ his letter? —Not yet. A．replying B．to reply C．replying to D．to reply to
．—Have your parents allowed you ______ his letter? —Not yet. A．replying B．to reply C．replying to D．to reply to
问题解答：
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