Question

________the workers were quite tired, _______ they still went on working.
A. Because; /                  B. Although; but           C. Although; /

Answer 1

C

解析试题分析：虽然工人们都很累了，但他们仍然继续工作。although 虽然，尽管，引导让步状语从句，不与but 连用。A选项不符合题意。故选C。
考点：考查连词。