Lilei was late for class yesterday the heavy traffic. A. because of B. because C. so

问题补充：

Lilei was late for class yesterday the heavy traffic.

A. because of B. because C. so

答案：

解析：Because of由于，后接短语。Because因为，后接句子。so因此。句意：李磊昨天迟到了，因为交通赌赛。故选A。