—Many people talk about "Didi". I really wonder ______.
—You call to order a taxi through it on your mobile phone easily.
A. how can I use them
B. who uses them most
C. what they are used for
相关试题
_______ children in Africa have little food to eat, and we can help them.
| A．Million | B．A millions | C．Millions of | D．Millions |
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