The building over there is a library, _____ is our gym.

A. on the east of which B. to the east of that

C. on the east of that    D. east of which.

        逗号后面是一个非限制性定语从句，关系代词不能用 that ，所以 B. to the east of that

和C. on the east of that  都是错误的。  A. on the east of which 和 D. east of which的含义都是“ gym 的位置在library的东面”，但是A. on the east of which表示 gym 和library接壤（即相连），两者之间没有间隔，其中的 east 是名词；D. east of which表示 gym 和library不是连在一起而是两者之间有间隔，其中的 east 是副词。所以，D. east of which 是正确答案。

The building over there is a library, _____ is our gym.

A. on the east of which B. to the east of that

C. on the east of that    D. east of which.

备注(1)：网友给出题目，填空处只能填“on the east of which” 或者“to the east of which”

备注(2)：on the east of which 表示“体育馆和图书馆是接壤处，即紧挨着”

备注(3)：to the east of which表示“体育馆是位于图书馆是东面，即不是紧挨着”

备注(4):填“to the east of which”应该是最佳答案，如果没有，就只有选A
【1】The building over there is a library, on the east of which is our gym.

解答：以上属于“介词短语”提前句首倒装结构，即表语+be+主语结构，on the east of which,为介词短语作表语，关系代词which引导非限制性定语从句并在定语从句作介词“of的宾语成分”关系代词which代替先行词“library”相当于“on the east of the library”

The building over there is a library, on the east of which is our gym.

=The building over there is a library and on the east of the library is our gym.

备注：介词“on”表示接壤处，即2个事物是紧紧挨在一起的。

Our gym is on the east of the library. 我们体育馆是紧挨在图书馆东面。

【2】The building over there is a library, to the east of which is our gym.

解答：以上属于“介词短语”提前句首倒装结构，即表语+be+主语结构，on the east of which,为介词短语作表语，关系代词which引导非限制性定语从句并在定语从句作介词“of的宾语成分”关系代词which代替先行词“library”相当于“to the east of the library”不能是名词短语“the east of the library”

The building over there is a library, to the east of which is our gym.

=The building over there is a library and to the east of the library is our gym.

备注：介词“to”表示不在范围之内，即2个事物不是紧挨着。

Our gym is to the east of the library. 我们体育馆是位于在图书馆东面。

 【3】The building over there is a library, east of which is our gym.

解答：east of which=east of the library, 被介词短语“of the library”

修饰的east只能是名词，即图书馆的东边/东面。与后面发生逻辑矛盾，因为不能说图书馆东面是图书馆，只能说体育馆在图书馆东边。所以作提前到句首的“表语”只能是“介词短语to/on the east of library”

East of the library is our gym(倒装语序)【错误句子】

Our gym is east of the library(陈述语序)【错误句子】

On the east of the library is our gym(倒装语序)【正确句子】

Our gym is on the east of the library(陈述语序)【正确句子】

To the east of the library is our gym(倒装语序)【正确句子】

Our gym is to the east of the library(陈述语序)【正确句子】

所以下面几个句子都是正确的

【1】The building over there is a library, to the east of which is our gym.

【备注：to the east of library  表示体育馆和图书馆不是接壤处。】

【2】The building over there is a library, on the east of which is our gym.

【备注：on the east of library  表示体育馆和图书馆是接壤处。】