[文法] 請問這題的答案

[LILYCHEN (站在幸福的門外)]

  There are over thirty keyboard commands that can prompt word-processing

  proceduress, but common usage _____ only a few.

  A. involves

  B. receives

  C. subscribes

  D. corresponds


  答案是A, 我選對了但是卻無法完全明白這句的意思, 請協助解答 thanks.



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心情這樣的晚上,我就切蔥,細碎細碎的切蔥.
這樣我縱然流淚也不迷失自己.

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推 jurassic:有超過三十個鍵盤的指令可以進行文字處理
推 jurassic:的程序，但一般的用法上僅需用到一些
推 julians:involve是"涉及"的意思, 轉一下可延伸生有
→ julians:牽連,與...相關
推 LILYCHEN:thanks for both of you. :)