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

試題分析：A. because因為（引導原因狀語從句）， B. since自從（引導時間狀語從句），C. unless除非（引導條件狀語從句），D. though雖然（引導讓步狀語從句），句意：消防隊員成功的在著火的房間救了所有的人，即使他們知道他們自己很危險。根據(jù)句意選D。
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