问题描述：
l______the retired teacher is still working hard for the people .
A.though old he is B.unless he is old C.old ao he is D.however he is old
我觉得应该选A但答案是C,
A.though old he is B.unless he is old C.old ao he is D.however he is old
我觉得应该选A但答案是C,
问题解答：
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