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【单选题】
和旅行社签订了旅游合同5月1日到大连旅游,由于有事不能参加预定的旅游,他打算让其弟弟去旅游,应当( )。
A.
勿须通知旅行社
B.
征得旅行社的同意，并赔偿其损失
C.
只要适当提前通知旅行社
D.
必须征得旅行社的同意
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