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
网友回答
(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。