高中英语单选,请给出理由.When first _____ to the market,these products e
高中英语单选,请给出理由.
When first _____ to the market,these products enjoyed great success.
A.introducing B.introduced
C.introduce D.being introduced
我选的是B,因为这里表被动,产品被推广到市场上.
如果选D的话,那就是一个ing分词作伴随状语了.这样引导这个ing分词短语的When不就是多余的吗?一般When是用来引导句子吧?