Einstein’s theory of relativity seemed hard to believe at the time _____.A、when he first introducedB、that he first introduced itC、he first introducedD、which he first introduced it-易过题库-题库最全的搜题网站

Einstein’s theory of relativity seemed hard to believe at the time _____.

Awhen he first introduced

Bthat he first introduced it

Che first introduced

Dwhich he first introduced it

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