请教英语

1. Is this laboratory ______ the students visited yesterday改为它的陈述语序是
This laboratory is______the students visited yesterday
2. Is this the laboratory ______ the students visited yesterday改为它的陈述语序是
This is the laboratory ______ the students visited yesterday
。所以1 .B, the one（作表语） , (the students visited）是定语从句，修饰the one
由于the one 作visited 的宾语，所以the one 后省略了that 或which.
2. A, that(它引导定语从句)，修饰先行词the laboratory, visited 的 宾语是that, 所以that 可省略
由于visited是及物动词，所以不可能出现介词in, 所以in which不对

visit 这个动词使用时后面不加任何介词。

visit to a place
这句话中，to which = where

可以试着改为陈述语。this is the laboratory where the students visited yesterday.
in which=where,一般在出现the place时用。

这个问你老师吧！