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The fireman succeeded in saving all the people in the house on fire, _______they knew they were in great danger themselves.

A.becauseB.sinceC.unlessD.though

D

解析试题分析:A. because因为(引导原因状语从句), B. since自从(引导时间状语从句),C. unless除非(引导条件状语从句),D. though虽然(引导让步状语从句),句意:消防队员成功的在着火的房间救了所有的人,即使他们知道他们自己很危险。根据句意选D。
考点:考查连词辨析

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