chhoughton04 chhoughton04
  • 16-05-2017
  • English
contestada

Which verb form is used to indicate the perfect progressive tense?

a) verb + -ed
b) be + verb + -ing
c) have + been + verb + -ing
d have + verb + -ed

Respuesta :

Аноним Аноним
  • 16-05-2017
The answer is b, i think

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