單項(xiàng)選擇題

While I was in the university, I learned taking a photo,（）is very useful now for me.

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

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This kind of material expands（）the temperature increasing.

A.to
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People at the party worried about him, because no one was aware（）he had gone.

A.of where
B.of the place where
C.where
D.the place