We are pleased to know that you have planned to come to the Autumn Guangzhou Fair. We wish to discuss with you some other import

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问题 We are pleased to know that you have planned to come to the Autumn Guangzhou Fair. We wish to discuss with you some other important things if you could come ______ your earliest convenience.

选项 A、by
B、on
C、in
D、at

答案 D

解析
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