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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