题目

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 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”。

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