Question

请问这题选什么？

Is this office ( ) some friends visit the day before yesterday A.which B.that C.whose D.the one
答案是D 为什么？

Answer 1

the one 在句子中做先行词 后面是省略that的定语从句。
转换成肯定句就是：this office is the one （that）ome friends visit the day before yesterday .
因为office不能单独一个词必须有冠词或者修饰词
如果换成this is the office 就可以直接加从句了

Answer 2

恢复成陈述语气 就是这个地方the one作主句表语 同时也是后面定语从句的先行词 定语从句的连接词that省略了
如果要选A/B
必须改成This is the office which/that some friends visit the day before yesterday.
问句形式就是Is this the office ( ) some friends visit the day before yesterday？