(   ) 5. A computer desk is used       putting a computer on.

A. in    B. at C. for    D. with

5. C be used for意為"被用來"，后接名詞或動名 詞。故選C 

題目來源：仁愛英語同步練習(xí)簿九年級上下冊 > Topic 1 When was it invented？

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