The World Health Organization has given some advice on________to protect us from being infected(感染)with H7N9.
| A．how |
| B．what |
| C．where |
| D．when |
The World Health Organization has given some advice on________to protect us from being infected(感染)with H7N9.
| A．how |
| B．what |
| C．where |
| D．when |
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