The politician has been warned that he would be getting into great trouble ____ stick to his standpoint.

A．were he to

B．he will

C．he was to

D．would he

某旅游团去木兰围场旅游，团员们骑马、射箭、吃烤肉，最后去商店购买纪念品。已知： (1)有人买了蒙古刀。 (2)有人没有买蒙古刀。 (3)该团的张先生和王女士都买了蒙古刀。如果以上三句话中只有一句为真，则以下哪项肯定为真

A．张先生和王女土都没有买蒙古刀。

B．张先生买了蒙古刀，但王女士没有买蒙古刀。

C．该旅游团的李先生买了蒙古刀。

D．张先生和王女士都买了蒙古刀。