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”。