题文
_____ reading may take up too much of your time, it is very helpful in raising your grades efficiently.
| A．Because |
| B．As |
| C．Once |
| D．While |
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_____ reading may take up too much of your time, it is very helpful in raising your grades efficiently.
| A．Because |
| B．As |
| C．Once |
| D．While |
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