Until he spoke I hadn't realized he didn't know anything about the subject.
A.If he didn't speak, I wouldn't realize he didn't know anything about the subject.
B.If he hadn't spoken, I wouldn't have realized he didn't know anything about the subject.
C.Unless he spoke I wouldn't realize he didn't know anything about the subject.
D.When he spoke I hadn't realized he didn't know anything about the subject

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