I had walked for six hours I was tired out. A. AfterB. BeforeC. WhenD. As

问题补充：

I had walked for six hours, I was tired out.

A. After

B. Before

C. When

D. As

答案：

(答案→)A. After

B. Before

C. When

D. As

解析：本题考查以after引导的时间状语从句，意为“在…之后”。句意为“步行了六小时后，我累坏了”。

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