【題目】It's eight o'clock.Jack ________ his room.

A. clean B. cleans C. cleaned D. is cleaning

【答案】D

【解析】句意：八點(diǎn)鐘了。杰克正在打掃他的房間。根據(jù)It's eight o'clock.可知此處表示正在某時(shí)做某事，故用現(xiàn)在進(jìn)行時(shí)be doing，故選D。

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