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None of the servants was ______ when Mr Smith wanted to send a message. A. available B. approachable C. attainable D. applicable [available] available 可获得的，有用的 [/available] [approachable] approachable 可接近的 [/approachable] [attainable] attainable 可获得的 [/attainable] [applicable] applicable 可应用的 [/applicable] | 
