Hawking became world-famous in          。

A his thirties in the 1970’s    B．the thirties in his 1970

 C．his thirties in  1970s   D．the thirties during the 1970

A。


解析:

考查數(shù)次的用法。in one’s thirties意為在某人三十多歲時(shí)，in／during the 1970o’s意為在20世紀(jì)70年代。

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