Well, for one thing you must understand what the sentence is saying; common sense and common knowledge play a part in knowing what is a reasonable, logical referent. This case, however, is typical in that the referent is most often the nearest preceding noun - which is 'opera'.
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rashinwell,if so,what should i do with this rule in sentences like :it is a flower , a flower is main subject and the antecedant for it.please guide me. Thanks for your kindness.