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

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(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。