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Return the book immediately to the library as soon as you___

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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?
选A.
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?