问题描述：
选择填空：从A、B、C中,选出一个最佳答案完成句子.
Look!The Smiths are having a great time （ ） in the supermaket.
A.to shop B.shopping C.shops
Look!The Smiths are having a great time （ ） in the supermaket.
A.to shop B.shopping C.shops
问题解答：
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