单选题Einstein’s theory of relativity seemed hard to believe at the time______ .Awhen he first introduced itBthat he first introduced itChe first introduced Dwhich he first introduced it
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。
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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