Einstein’s theory of relativity seemed hard to believe at th

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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,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
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Einstein’s theory of relativity seemed hard to believe at th Einstein's theory of relativity proved____ 来一个英语高手!Einstein's theory of relativity ______ his theory of relativity ,einstein is still admired b ALBERT EINSTEIN AND THE THEORY OF RELATIVITY怎么样 theory of relativity是什么意思 Einstein`s most famous theory is that we cail,th Theory of R Einstein's theory proved to be correct with time. Einstein's most famous theory is ___ the Theory of Relativit Einstein's most important theory is we call the Theory of Re that引导表语从句Einstein"s most famous theory is ___we call the Th It’s hard to make friends if you stay at home _(lone) all th