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单选题
Einstein’s theory of relativity seemed hard to believe at the time______ .
A

when he first introduced it

B

that he first introduced it

C

he first introduced    

D

which he first introduced it


参考答案

参考解析
解析:
爱因斯坦第一次提出相对论时,好像很难令人相信。at the time后常用关系副词when引导定语从句,故A项正确。
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