When___on rocks,the plant grows to a bush,____broad leaves and large flowers.

问题描述:

When___on rocks,the plant grows to a bush,____broad leaves and large flowers.
A growing,having B grown,to have C grew,having D growing,and have

A
句子中已有谓语,所以只能选择分词来作伴随状语,又因为是主动关系,故用ing形式