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21. Move a few steps, and the oil-paintings look better ______.

A. in the distance          B. at once                     C. in the open air                D. at a distance

Move a few steps, and the oil-paintings look better ______.

A. in the distance　 B. at once　 C. in the open air　 D. at a distance

21. Move a few steps, and the oil-paintings look better ______.