I'd have bought Sam's car if I'd known he was sell...

Câu hỏi: I'd have bought Sam's car if I'd known he was selling it.

A. I knew Sam wanted to sell his car.

B. I didn't buy Sam's car because I didn't know he was selling it.

C. I bought the car without knowing it was Sam's.

D. I'll buy the car as soon as Sam decides to sell it.