Only when I read the Frog by Moyan a second time to appreciate his magic realism.
A. did I begin
B. I began
C. had I begun
D. I have begun
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(答案→)A. did I begin
B. I began
C. had I begun
D. I have begun
解析：：考查倒装句和时态。Only放在句首，且强调接状语的时候，主句使用部分倒装的形式。本题only放在了句首，强调的是时间状语从句，故后面使用倒装，排除BD。C项使用过去完成时，从本句的意思来 看，不需要使用过去完成时。句意：只有当我又一次读了莫言的Frog的时候，我才开始欣赏他魔幻般的现实主义写作方法。故A正确。