问题描述：
Where are Mr and Mrs Smith.--They ___ there twice before.
A have been to ;have gone
B have gone to ;have been
C have been to ;have gone to
D have gone to ;have been to
理由!快速!
Where are Mr and Mrs Smith.--They ____Italy.They ___ there twice before.
A have been to ;have gone
B have gone to ;have been
C have been to ;have gone to
D have gone to ;have been to
理由!快速!
Where are Mr and Mrs Smith.--They ____Italy.They ___ there twice before.
问题解答：
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