Question

【题目】Keep quiet，Tom. Your sister in her room.

A.studiesB.has studiedC.is studyingD.studied

Answer 1

【答案】C

【解析】

句意：保持安静，汤姆。你姐姐正在房间里学习。

A. studies学习，动词三单；B. has studied已经学习，现在完成时；C. is studying正在学习，现在进行时；D. studied学习，动词过去式。根据Keep quiet，Tom.可判断，汤姆的姐姐正在房间里学习。所以后句时态应是现在进行时（am/ is/ are +doing）；主语Your sister是单数，故用is。故选C。