.Hawking became world-famous in .A. his thirties in the 1970’s B. the thirties in his 1970

问题补充：

.Hawking became world-famous in .

A. his thirties in the 1970’s

B. the thirties in his 1970

C. his 30s in 1970’s

D. the thirties during the 1970

答案：

A. his thirties in the 1970’s

B. the thirties in his 1970

C. his 30s in 1970’s

D. the thirties during the 1970

解析：in one’s thirties 在某人三十多岁时，in/during the 1970s意思是“在二十世纪七十年代”。