问题
选择题
He looked quite healthy though he was _________.
A．in seventy
B．in his seventy
C．at seventies
D．at the age of seventy
答案
D
“他70多岁时”应该是in his seventies，A、B、C三项都不正确；at the age of seventy意思是“在他70岁时”。
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