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| Kenneth G. Wilson (1923–). The Columbia Guide to Standard American English. 1993. |
| proficient (adj.) |
| combines most frequently with the prepositions at and in: She is highly proficient at [in] solid geometry. When the proficiency involves a musical instrument or a machine of some sort, proficient can combine with on, at, or with: He is proficient on [at, with] the computer [the trombone]. | 1 |
| The Columbia Guide to Standard American English. Copyright © 1993 Columbia University Press. |
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