Tom is going on a picnic.A .So am I B.So was I C.Neither am I D.Nor am I 原因是什么?

问题描述:

Tom is going on a picnic.A .So am I B.So was I C.Neither am I D.Nor am I 原因是什么?

A.原因是前面的句子谓语是is ,由此知道时态不能使过去时,前句是肯定,后面也应该是肯定,故选A