Hi, 9. The successful education of children with speech defects involves ---- all means of approach. A) to explore B) exploring C) having explored D) having been explored E) to have explored This question is taken from an official proficiency exam carried out in Turkey, UDS Health.
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MamgerAs to using "having done" after involve, in the sentence above I thought it is possible to think that the successful education of children with speech defects requires the educators to have explor