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16. Internet companies have long wanted to put entertainment content online, but fear of piracy, illegal downloading and disruption of their revenue model have so far made the studios ___________ their product.
(A)hold on tightly to
(B)continue on
(C)keep on
(D)make effort to

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 【站僕】摩檸Morning：有沒有達人來解釋一下?
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16. Internet companies have long wanted ..-阿摩線上測驗