She didn’t understand the benefits of volunteering...

Câu hỏi: She didn’t understand the benefits of volunteering until she joined this club.

A. Not until she joined this club did she understand the benefits of volunteering.

B. It was not until she joined this club did she understand the benefits of volunteering.

C. Not until did she join this club, she understood the benefits of volunteering.

D. Not until she joined this club that she understood the benefits of volunteering.