Greece has made \"significant\" and \"perceptible\" progress in implementing necessary structural reforms, but also needs to do more, European Central Bank chief Mario Draghi said Tuesday. \"It\'s quite clear that the progress at the level of undertaking the necessary policy reform has been perceptible and significant and it\'s also clear that more needs to be done,\" Draghi told a hearing of the European Parliament\'s committee for economic and monetary affairs in Brussels, broadcast via the parliament\'s website.