He has been to America twice, _____.
A．so have IB．so I haveC．I have soD．so did I
A
So+助動(dòng)詞/情態(tài)動(dòng)詞/系動(dòng)詞+S，表示前面所說的肯定情況適用于后者。他到美國去過兩次，我也如此。故選A。
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