---Look. Your grandfather is playing tennis again.---I'm glad he is in good health. Even though he is ________, he still plays tennis now and then.
A.in the eighties B.at his eightieth C.in his eighties D.at the eightieth正确答案C
---Look. Your grandfather is playing tennis again.---I'm glad he is in good health. Even though he is ________, he still plays tennis now and then.
A.in the eighties B.at his eightieth C.in his eighties D.at the eightieth正确答案C
