He has been to America twice .A. so have IB. so I haveC. I have soD. so did I

问题补充：

He has been to America twice, .

A. so have I

B. so I have

C. I have so

D. so did I

答案：

(答案→)A. so have I

B. so I have

C. I have so

D. so did I

解析：So+助动词/情态动词/系动词+S，表示前面所说的肯定情况适用于后者。他到美国去过两次，我也如此。故选A。