单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Between April and December.
B．In April.
C．In December.
D．He isn’t certain.

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It was during the period when Einstein was studying for his doctorate that he began his______.

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Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。