his father has been away for more than one year John can still keep doing what he needs t

问题补充：

his father has been away for more than one year, John can still keep doing what he needs to.

A. While

B. When

C. As

D. Whether

答案：

(答案→)A. While

B. When

C. As

D. Whether

解析：句意：尽管他父亲已经离开一年多了，可John仍然能够继续做他需要做的事情。在所给的四个选项中只有while可以引导让步状语从句，故A正确。

考点: 考查状语从句的用法。