Cars do cause us some health problems－in fact far more serious _______than mobile phones do.
【选项 】
| A．one |
| B．ones |
| C．it |
| D．those |
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Cars do cause us some health problems－in fact far more serious _______than mobile phones do.
【选项 】
| A．one |
| B．ones |
| C．it |
| D．those |
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