They finished one project. They started working on...

Câu hỏi: They finished one project. They started working on the next.

A Only if they had finished one project did they start working on the next.

B Had they finished one project, they would have started working on the next.

C Hardly had they finished one project when they started working on the next.

D Not until did they start working on the next project then they finished one.