... then what I know today, I would have saved ...

★ Subjunctives

… then what I know today, I would have saved myself a lot of time and trouble over the years.

A. had I known

B. did I know

C. If I know

D. If I would know

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I … you sooner had someone told me you were in the hospital.

A. would have visited

B. visited

C. had visited

D. visit