—Why was he late for school?
— his bike was broken on the road.
A. Since
B. Because
C. As
D. Because of
网友回答
A. Since
(答案→)B. Because
C. As
D. Because of
解析：A. Since自从 B. Because因为 C. As 当…时候 D. Because of由于；句意：他为什么上学迟到？因为他的自行车在路上坏掉了。Because因为，后接从句，而Because of由于，只作为介词短语，后面不接从句，故选B