單項(xiàng)選擇題

The sun heats the earth,（）is very important to living things.

A.that
B.what
C.which
D.where

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This is the problem（）we have no good solution as yet.

A.to that
B.which
C.for which
D.to which

單項(xiàng)選擇題

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

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