483. I saw Jane and her boyfriend in the park at eight yesterday evening.
Impossible. She _____ TV with me in my home then.
A.watched
B.had watched
C.would watch
D.was watching
484.Have you handed in your schoolwork yet?
Yes,I have.I guess it _________ now.
A.has graded
B.is graded
C.is being graded
D.is grading
483.答案是D;此处时间状语then指at eight yesterday evening。表示过去某一时间点正在进行的动作，故用过去进行时。
484.答案是C;由now得知作业正在被打分（评阅），故选C。
