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單項(xiàng)選擇題

This is the house（）he lived last year.

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

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

A.that
B.what
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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

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