Question

      we were quite tired,        we still went on working.
A．Because; /           B．Although; but            C．Although; /

Answer 1

C

试题分析：句意:虽然我们很累了，但是我们仍然继续工作。because 表示原因，意思是因为，在这里不符合句意。although 虽然，引导让步状语从句，不能和but 连用，故B不对；选C。