问题
选择题
-- _______ the soldiers are very tried, __ they keep on working.
--They are great. We must learn from them.
A．Because; /
B．Though; /
C．Because; so
D．Though; but
答案
答案：B
考查连词。Because因为；Though虽然，尽管； so因此；but但是；句意：虽然这些士兵很累，但是他们坚持工作。though引导的让步状语从句，不能与but同时出现在一个句子中。故选B。