题干
Yesterday it rained heavily when school was over. So we _______ stay in our classroom.
A：should
B：must
C：had to
答案(点此获取答案解析）
C
Yesterday it rained heavily when school was over. So we _______ stay in our classroom.
A：should
B：must
C：had to
在毛霉细胞质内分解至丙酮酸的过程中，下列叙述正确的是（ ）