问题描述：
Where are you-----?-We're going to Shanghai. A going on holiday B going to on holiday
Where are you-----?-We're going to Shanghai.
A going on holiday B going to on holiday
C going at holiday D going to at holiday
Where are you-----?-We're going to Shanghai.
A going on holiday B going to on holiday
C going at holiday D going to at holiday
问题解答：
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