原因状语从句表达情绪缘由 — 英语选择题
题目
校运动会当天，Leo错过了校车，最后迟到了。他感到很沮丧。哪句话正确表达了他沮丧的原因？
A. Leo felt upset because he missed the school bus.
B. Leo felt upset so he missed the school bus.
C. Leo felt upset but he missed the school bus.
D. Leo felt upset although he missed the school bus.