Afewyearsago,computerswereusedonlyinbusiness,inmedicine,andforscientificresearch,_____thesedaystheyarecommoninalmostallschools.
A.though B.whereas C.so D.therefore正确答案B
Afewyearsago,computerswereusedonlyinbusiness,inmedicine,andforscientificresearch,_____thesedaystheyarecommoninalmostallschools.
A.though B.whereas C.so D.therefore正确答案B