—Jim your bedroom is so dirty.—Sorry Mum. I it at once.A. have cleanedB. cleanedC. clea

问题补充：

—Jim, your bedroom is so dirty.

—Sorry, Mum. I it at once.

A. have cleaned

B. cleaned

C. clean

D. will clean

答案：

A. have cleaned

B. cleaned

C. clean

(答案→)D. will clean

解析：句意：——吉姆，你的卧室是如此的脏。——对不起，妈妈。我马上打扫。at once 立刻；马上，根据时间状语at once，可知用一般将来时，故选D。

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