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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