When John left the office, Amy _____ at her desk. - 题库学习平台

When John left the office, Amy _____ at her desk.
A、is still working
B、has still working
C、had still worked
D、was still working
【正确答案】：D
【题目解析】：when引导的时间状语从句，从句用一般过去时，主句要用过去进行时。

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