Question

Return the book immediately to the library as soon as you_____with it.

A.finish B.are finished C.have finished D.are finishing
为什么不能选C？谢谢

Answer 1

选A。

解释：
这种祈使句的形式 相当于 带有时间状语从句的 句子，如下：
I will return the book immediately to the library when I finish with it.

这种句子的时态要求是：主句用一般将来时，从句用一般现在时。

所以不能选C。明白了吗？

Answer 2

选 B are finished
as soon as you 【are finished】 with it，一旦你读完了，
如果用 have finished，就不需要 with了。直接说，as soon as you 【have finished reading】 it

追问

我也奇怪为什么正确答案是A（我刚找到了答案）