one of them have responded vs one of them has responded

Some examples from the web:

• To date, all Member States except one have responded.
• The EU's response to the disaster in Japan has been the right one: we have responded rapidly, without panicking.
• But last night he finally responded to one of my little hints.
• Mr President, may I return briefly to Burma, because the Commissioner has not responded to one of my previous points.
• Nineteen (out of the 21) committees responded, one of which (ECON) replied by means of a letter to the rapporteur.
• I went off in search of my mother, but the street was full of shadows and no one responded.
• Mr President, the Convention's conclusions, which are going to be discussed at the Thessaloniki Council, should have responded to one global question: how can we bring Europe closer to the citizens?
• No one responded to my video, did they?
• You were just the only one that responded.
• Only one importer responded to the notice of initiation and initially expressed its willingness to cooperate.
• Matty had responded with one single letter.
• You sent Raggedy Andy masks like this one to everyone who responded.
• Out of the 12 patients enrolled, 9 responded, one completely and 8 partially.
• I picked myself up, and I burned my vera chang, and I sent out 300 resumes to every newspaper I could find, and only one responded - you know, "eastwick."
• In the previously treated patients, overall, 95% of bleeds responded to one or two intravenous injections of KOGENATE Bayer.
• In the face of these challenges, the Member States have not always responded with one voice.
• Normally, I'd say that a woman should do it, but in this case, I mean, you're the only one she really responded to earlier.
• The further supplementary question on the meeting of the three countries in Berlin is one that I responded to in a previous part-session.
• One producer in Turkey responded to the questionnaire sent to all producers of aluminium foil in Turkey.
• One of them, Belarus, is a dramatic example of self-isolation, to which we have responded in the past with a policy marked by the 'too little, too late' syndrome, both in terms of sanctions and of incentives.

Some examples from the web:

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