this is the biggest laborary _we have ever built in our school

this is the biggest laborary _we have ever built in our school
A.which b.that c.where d.what f.who
答案是B
that引导的定语从句
there isn't much _I can do
A.which b.that c.where d.what f.who
答案是D
there is no difficulty_can't be overcome in the world
A.which b.that c.where d.what f.who
答案还是B