剛才是誰(shuí)想出了這個(gè)好主意啊?

Who ________ this good idea just now?

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A.trip B.tree

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How has technology made your life easier? When you go to a shopping mall, you can enjoy free Wi-Fi there. (A)When you want to take a taxi, you can book one with your phone. In fact, all of these things can be seen as the first building blocks of a smart city.

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____________________

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