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As our factory is now fully occupied with orders, we regret having to _________ yours.
A、refuse
B、decline
C、reject
D、return
【正确答案】：B
【题目解析】：refuse拒绝；decline谢绝，婉拒；reject拒绝；return返回，归还句意：由于我们工厂现在订单已满，很抱歉，我们不得不谢绝你方订单。