[ Conditional Sentences ]
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.

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