He looked quite healthy though he was __________.
A. in seventy B. in his seventy
C. at seventies D. at the age of seventy
He looked quite healthy though he was __________.
A. in seventy B. in his seventy
C. at seventies D. at the age of seventy
D
at the age of seventy 70岁；某人70多岁in one's seventies。