A rescue worker risked his life saving two tourists who            (trap) in the mountains for two days.

【答案】

广法高网心件4543司aae7术4436b9a1ed3b402a东得37e1b860学89c5途西优43d8eb2f点量科技400b秀法-公a654习元c61ce1ff软径有得是512a69b3c481慧a1da高升3a5eb442限

件4543高广法高4108-限42a1的得优43d8eb2f点量元c61ce1ffb68c4cc9点量途西升3a5eb442技400b秀法软径31c6学89c5科有得是512a69b3c48140e0慧a1da高网心ad57公a654习东得37e1b860司aae7术4436b9a1ed3b402a had been trapped

句意：一名救援人员冒着生命危险救出了两名被困在山里两天的游客。分析句子结构可知，空处在定语从句中作谓语，且trap与先行词tourists之间为动宾关系，此处应用被动语态;又因为此处表示在过去动作risked his life之前完成的动作，即"过去的过去"，所以用过去完成时的被动语态。