The plan is still in its early stage ____there is room for improvement.
问题描述：
The plan is still in its early stage ____there is room for improvement.
A that B how C which D when 选什么为什么
答
应该选when,此处when为关系副词,引导定语从句.The plan is still in its early stage when there is room for improvement.when =in its early stage,汉语可以译为“这种植物仍旧处于其生长早期,在这个时期（when）...