如何区分从句与强调句?1.It was in the classroom____we often have classe

如何区分从句与强调句?
1.It was in the classroom____we often have classes ________we had a party last night .A .where ,that B.that ,where C.where ,which D.which ,where这个题该选择哪个答案?2.Was it the building ______many reporters were interviewing the engineer________designed a new kind of toy