單項選擇題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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2.單項選擇題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

3.單項選擇題A sudden noise of a fire-engine made him（）to the door.

A.hurrying
B.hurried
C.hurry
D.to hurry

4.單項選擇題（）his examination of the patient, the doctor wrote out a prescription.

A.Having finished
B.Finishing
C.Finished
D.Having been finished