Условие задания:

3 Б.
Choose the correct question in present perfect continuous. Study the example.
  
Example:
 
Correct: How long has John been learning English?
  
Incorrect: How long have John been learning English? (We use 'has' with 'he')
  
Incorrect: How long has Boris been learnning English? (We don't double the letter 'n' when adding -ing)
 
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