单项选择题
A.that B.which C.where D.what
The sun heats the earth,（）is very important to living t...
单项选择题The sun heats the earth,（）is very important to living things.
A.that B.what C.which D.where
This is the problem（）we have no good solution as yet.A....
单项选择题This is the problem（）we have no good solution as yet.
A.to that B.which C.for which D.to which
Last month, he paid a visit to the village（）he had once...
单项选择题Last month, he paid a visit to the village（）he had once worked for five years.
A.where B.which C.that D.in that
