Einstein’stheoryofrelativityseemedhardtobelieveatthetime_____.
A.when he first introduced B.that he first introduced it C.he first introduced D.which he first introduced it正确答案B
Einstein’stheoryofrelativityseemedhardtobelieveatthetime_____.
A.when he first introduced B.that he first introduced it C.he first introduced D.which he first introduced it正确答案B
