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Ihadnotbeenreadingforhalfanhour       Iheardstepsoutsid...

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问题详情:

Ihadnotbeenreadingforhalfanhour       Iheardstepsoutsid...

I had not been reading for half an hour        I heard steps outside.


A. while                       B. as                            C. when                       D. since

【回答】

C  


 

知识点:状语从句

题型:选择题