情态动词疑问She __ be ill because I saw her playing tennis just no

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/09 19:34:37

情态动词疑问
She __ be ill because I saw her playing tennis just now.
A.can't B.couldn't C.mustn't D.may not
为什么选A?because后半句是过去时态,前面为什么不用C?
saw her playing这是什么时态?
雪的凝诺说can't be 是否定句中的表猜测，那么为什么本题不选B呢？because后半句都用了过去时，那么怎么就选择它的前半句用一般现在时呢？

1.mustn't 是不准的意思,而can't be 是否定句中的表猜测,意思为不可能,肯定句表猜测是must be ,意思为一定是
2.这个短语的句型是see sb doing sth 是在那一刻某人正在干某事
而see sb do ,是看见某人干某事的全过程,比如 see the traffic accident happen

i saw her wacthing tv in her bedroom just now.she ()be at ho I ___ (be) ill.So I ___ (be) absent from the meeting just no i like playing football and playing tennis 句子中的动词 She （）（dry）her hair when I saw her 动词填空. I saw some boys playing games这句话的Be动词呢? i am sorry to hear that sandra is ill again.she is __ her fr i have no idea __ she will be back tomorrow. I borrowed a dictionary of __ just now a.she b.her c.her`s d 26.Mary _______ be at home.I saw her in the library just now 6.Mary _______ be at home.I saw her in the building just now She ___ on her way to school,I just phoned her home and no o She's c___a doctor because her mother is ill.