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Correct form of the verb

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  • His plane took off/ has taken off a few minutes ago.
    His plane took off a few minutes ago.
  • The president has resigned / has been resigned and a new president has elected / has been elected.
    The president has resigned and a new president has been elected.
  • I work / 've been working in Dubai since last March.
    I've been working in Dubai since last March.
  • How many e-mails have you sent / have you been sending?
    How many e-mails have you sent?
  • A huge snowstorm has hit / has been hit New York.
    A huge snowstorm has hit New York.
  • What did you do / have you been doing in the bathroom? You were / 've been in there for ages.
    What have you been doing in the bathroom? You've been in there for ages.