grandfather worked very hard, he couldn’t support the big family.
A. Though, but
B. /, and
C. Though, and
D. Though, /
网友回答
A. Though, but
B. /, and
C. Though, and
(答案→)D. Though, /
解析：连词辨析。Though虽然，尽管；but但是；and和，并且。句意：虽然我的爷爷工作非常努力，但是他也不能维持这个家庭。Though本身即可表示虽然但是的含义，故选D。