Choose the alternative that completes the text. 

Próximas questões
Com base no mesmo assunto
Q1987293 Inglês
Suggestion boxes

David Nunan

       It may not be a high-tech device, but the suggestion box has probably done more to boost corporate efficiency over the years ________ even the most powerful computer. Suggestion boxes allow workers to recommend ways of making their jobs easier and offer employers the chance to save money - or make even more. 

Listen In, Second Edition, Student Book 1, Thomson Heinle
Choose the alternative that completes the text. 
Alternativas