He was only in _______ at that time.
He was only in _______ at that time.
A、his 30’s
B、the 30’s
C、his thirties
D、the thirties
【正确答案】：C
【题目解析】：in one's 数字s
表示在某人多少岁的时候

in his 30s 表示：在他30多岁的时候，因此选C

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