两道英语语法 急Is this research center_____you visited the modern e

Is this research center ________ we visited the modern equip Is this research center____you visited the modern equipment Is this research center _____ you visited the modern equipme Is this research center ___you visited the modern equipment Is this research center ___ you visited the modern equipment 我想问一道英语题is this research center______you visited the modern is this research center ___ the guests visited yesterday. Is this the research center____the foreigners visited last w is this school___you ever visited?is this the school___you e Is this research centre （ ）the foreign guests visited last w is this research centre _____the foreign guests visited last 两道英语题 解释This is the factory_____(where/which)we visited last