问题
At present, many people like talking about “Kuaidi” and “Didi”. I really wonder ______.—You call to order a taxi through them on your mobile phone easily.
A:how can I use them
B:who uses them most
C:what they are used for
D:when do people use them;
B:who uses them most
C:what they are used for
D:when do people use them;
正确答案是：
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