I came across this old book while I_____

I came across this old

单选题 I came across this old book while I______my room

A.clean

B.will clean

C.have cleaned

D.was cleaning

正确答案： D

答案解析: 本题考查时态。句意：我在打扫房间的时候偶然发现了这本旧书。 while引导时间状语从句时，从句常用进行时，表示动作与主句谓语同时发生。由主句中的came可知，本句整体时态为过去时。故本题选D。

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