There are so many foggy days these years. We all wonder ______________________.
| A．what can we do to prevent it |
| B．what we can do to prevent it |
| C．how can we do to prevent it |
| D．how we can do to prevent it |
There are so many foggy days these years. We all wonder ______________________.
| A．what can we do to prevent it |
| B．what we can do to prevent it |
| C．how can we do to prevent it |
| D．how we can do to prevent it |
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