Question

this is the school_______we visited three days ago A.where B./ C.when D.what

解释要简单易懂千万不要说那些主谓宾定状之类的

Answer 1

B
1、This is the school.
2、We visited the school three days ago.
3、将两句组合：
直接连接：This is the school we visited the school three days ago.（the school 在同一个句子中出现两次，第二个应当用代词替代）
语法合并：This is the school we visited （which/that）three days ago.
语法调适：This is the school （which/that）we visited three days ago.
语法规则：如果关系代词在从句中充当宾语，可以省略。
因此，This is the school we visited three days ago.