一道英语选择题
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
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 【答案】 ：A 【解析】 ：when 引导的时间状语从句 .
答案是 A.when he first introduced when 在这里是个关系代词 relative pronoun, 返指 the time. 虽然 B.也有关系代词 that，但通常如果 time 字后面要跟关系代词，那末，这关系代词必定是when. 所以不能用 B.
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