Is the exhibition _____ the foreign friends visited yesterday?
A．what
B．the one
C．which
D．ｗhere

参考答案：B 答案解析： 将句子改为肯定句，the exhibition is ____ (the foreign friends visited yesterday)划（）部分为定语从句，定语从句必须有先行词。只有 the one可以充当先行词，故选择B。