来自李子扬的问题
来一个英语高手!Einstein's theory of relativity seemed hard to believe at the time ___.选哪一个?A.whenhe first introducedB.thathe first introduced itC.he
来一个英语高手!Einstein's theory of relativity seemed hard to believe at the time ___.选哪一个?A.whenhe first introducedB.thathe first introduced itC.he first introducedD.whichhe first introduced it要解释下!
