题文
--- My dad bought me a new MP4 player, but I don’t know .
| A．what to use | B．what to use it | C．how to use it | D．when to use it |
--- My dad bought me a new MP4 player, but I don’t know .
| A．what to use | B．what to use it | C．how to use it | D．when to use it |
试题篮
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