Had Kathy studied hard, she would have passed the...

Câu hỏi: Had Kathy studied hard, she would have passed the examination.

A Kathy knew that she would succeed in the examination.

B But for her  hard study, Kathy would have succeeded in the examination.

C Kathy studied  very hard but she did not succeed in the examination.

D Kathy did not study hard, so she failed.