He is short-sighted. Therefore, he has to wear the...

Câu hỏi: He is short-sighted. Therefore, he has to wear the glasses.    

A If he isn’t short-sighted, he won’t have to wear the glasses.

B If he hadn’t been short-sighted, he wouldn’t  have had to wear the glasses.

C If he weren’t short-sighted, he wouldn’t have to wear the glasses.

D Should he not be short-sighted, he won’t have to wear the glasses.