A,C 缺宾语,introduce 是及物动词,得有宾语
D at which 就对了,单个which 不能做时间状语
B 中的that 等于when= at which,在定语从句中作时间状语
请在客户端右上角评价点“满意”即可,
Einstein’s theory of relativity seemed hard to believe at the time _
Einstein’s theory of relativity seemed hard to believe at the time _
A.when he first introduced B.that he first introduced it C.he first introduced D.which he first introduced it
A.when he first introduced B.that he first introduced it C.he first introduced D.which he first introduced it
英语人气：369 ℃时间：2020-01-27 20:00:19
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