how – their task – long – been – doing – have – they? (choose the correct sentence)

how long the task have been doing they the task?

how long have they doing the task?

how long have they been doing their task?

how – their task – long – been – doing – have – they? (cho

1.	how – their task – long – been – doing – have – they? (choose the correct sentence)
A.	how they have been long doing?
B.	how long have they doing the task?
C.	how long have they been doing their task?
D.	how long the task have been doing they the task?
Answer» D. how long the task have been doing they the task?