来一个英语高手!Einstein's theory of relativity seemed hard to believe at the
问题描述：
来一个英语高手!Einstein's theory of relativity seemed hard to believe at the time ___.选哪一个?A.when he first introduced B.that he first introduced it C.he first introduced D.which he first introduced it要解释下!
答
没一个正确的.应该是：
when he first introduced it
或者：
when it was first introduced
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请在客户端右上角评价点“满意”即可第一个加一个it就对了是不是？？？c为什么？？我看成同位语了是的定语从句。 at the time when hefirst introduced it(他首次介绍相对论的时候）可见when hefirst introduced it是个定语从句， 修饰the time 的introduce 是及物动词， 后面要接宾语