Q:

Kala said to Radha, " Who were you speaking to over the phone? " 

• 1
  Kala asked Radha that who she was speaking to over the phone.
• 2
  Kala asked Radha that who she had been speaking to over the phone.
• 3
  Kala asked Radha who she had been speaking to over the phone.
• 4
  Kala asked Radha who she has been speaking to over the phone.