时间状语从句描述生长过程 — 英语选择题
题目
一粒豆种先长出根，接着幼芽钻出土壤，之后第一片叶子展开。哪句话正确描述了叶子展开的时间？A. When the shoot comes above the soil, the first leaf opens. B. Before the shoot comes above the soil, the first leaf opens. C. After the first leaf opens, the shoot comes above the soil. D. When the root begins to grow, the first leaf opens.