Although they feel tired, _________they still go on working.
A．so,B．butC．/D．a(chǎn)nd
C

試題分析：so因此；but但是，可是；and和，并且。句意：盡管他們感到很累，但是他們?nèi)耘f繼續(xù)工作。 中though本身即可表示轉(zhuǎn)折含義，不搭配其它連詞使用，故選C。
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