21. Move a few steps and the oil-paintings look better .A. in the distance B. at onceC. i

问题补充：

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

答案：

A. in the distance

B. at once

C. in the open air

D. at a distance

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