19、I _____ you already that washing hands often will help prevent the A-H1Nl Flu．

A．tell         B．told        C．have told           D．a(chǎn)m telling

19、C

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I _____ you already that washing hands often will help prevent the A-H1Nl Flu．

A．tell         B．told        C．have told           D．a(chǎn)m telling

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