有关非谓语动词when first----to the market,these products enjoyed great success.A introduced B introducing Cintroduce D being introduced我知道答案选A,是被介绍,但我想知道,逗号前那句号是状语从句,为什么要选非谓语

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有关非谓语动词when first----to the market,these products enjoyed great success.A introduced B introducing Cintroduce D being introduced我知道答案选A,是被介绍,但我想知道,逗号前那句号是状语从句,为什么要选非谓语

有关非谓语动词when first----to the market,these products enjoyed great success.A introduced B introducing Cintroduce D being introduced我知道答案选A,是被介绍,但我想知道,逗号前那句号是状语从句,为什么要选非谓语
有关非谓语动词
when first----to the market,these products enjoyed great success.
A introduced B introducing Cintroduce D being introduced
我知道答案选A,是被介绍,但我想知道,逗号前那句号是状语从句,为什么要选非谓语动词,不是应该选谓语吗?如果要有be introduced可不可以选?

有关非谓语动词when first----to the market,these products enjoyed great success.A introduced B introducing Cintroduce D being introduced我知道答案选A,是被介绍,但我想知道,逗号前那句号是状语从句,为什么要选非谓语
这个从句的完整结构应该是when these products are first introduced to the market,……谓语动词是are.现在这个句子是一个省略句,主语和谓语动词都一并被省略掉了,但仍然保留introduced 及以后的修饰成分.这种省略方式是该种省略句的基本用法.所以应该选A.所以be introduced不可以选.