19. What are you ____? A) does B) do C) doing

Solution:

• The phrase 'What are you...?' is part of the present continuous tense.
• The present continuous tense is formed with the verb 'to be' (am, is, are) + the present participle (verb + -ing).
• 'Does' is an auxiliary verb used in the present simple for questions and negatives with third-person singular subjects.
• 'Do' is an auxiliary verb used in the present simple for questions and negatives with other subjects (I, you, we, they).
• 'Doing' is the present participle of the verb 'to do'.
• Therefore, 'doing' is the correct word to complete the present continuous question.

Answer: C) doing