问题补充：
Our new physics teacher got a pretty and lovely girl .
A. in his thirty
B. in his thirty’s
C. in his thirtieth
D. in his thirties
答案：
A. in his thirty
B. in his thirty’s
C. in his thirtieth
(答案→)D. in his thirties
解析：句意：我们的新物理老师在她三十多岁时有了一个漂亮可爱的女儿。in one’s +数词复数，在某人几十多岁时。结合句意，故选D。
