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I failed in the final examination last term and only then_______the importance of studies.

A.I realized                                B.I had realized

C.had I realized                           D.did I realize

I failed in the final examination last term and only then _______ the importance of studies.?

A. I realized　B. I had realized?

C. had I realized D. did I realize?

I failed in the final examination last term and only then_____ the importance of studies.

I failed in the final examination last term and only then ________ the importance of studies.

 I failed in the final examination last term and only then ________ the importance of studies.

A．I realized                              B．I had realized

C．had I realized                          D．did I realize