Question

【题目】My grandfather showed great courage in the face of serious illness when he was in his ________. (seventy)

Answer 1

【答案】seventies

【解析】

句意：在我祖父七十多岁时，他面对严重的疾病表现出了极大的勇气。

in one’s +逢十的基数词复数，表示在某人几十岁时，固定用法，seventy的复数是seventies，故答案是seventies。