We are late for school the heavy snow .A because B because of C as

问题补充：

We are late for school the heavy snow .

A,because B, because of C, as

答案：

解析：because因为,后面接从句;because of因为,后面接名词性短语;as因为,随着,多众所周知,显而易见的原因,一般位于句首.句意:因为大学,我们上学迟到了.结合语境可知选B.