Question

This is the factory ( )my father has worked for 20 years

Answer 1

是。引导先行词。that可指人，但which不能。inwhich是介词
关系代词，不合题意……望采纳

Answer 2

两个答案，可以是where,
也可以是in
which,
因为在定语从句里，where=in
which==in
the
factory.
所以两个答案。where和in
which在定语从句里充当地点状语。

Answer 3

这道题应该选A哦，
前面“This
is
the…”已表明地点，后面有一个work,很明显work后面缺一个介词，又因为从句中缺地点状语.而in
which=where,in
which引导定语从句
where引导地点状语从句。所以选A.

Answer 4

这个我问过余老师。她说要不就用where
要不就用which然后再后面加in