—Why was he late for school?— his bike was broken on the road.A. SinceB. BecauseC. AsD. B

问题补充：

—Why was he late for school?

— his bike was broken on the road.

A. Since

B. Because

C. As

D. Because of

答案：

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