—My dad bought me a new MP4, but I don’t know __________.
—Let’s read the instruction.
| A．what to use | B．how to use it |
| C．what to use it | D．when to use it |
—My dad bought me a new MP4, but I don’t know __________.
—Let’s read the instruction.
| A．what to use | B．how to use it |
| C．what to use it | D．when to use it |
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