.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
网友回答
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”。