That hazy（雾霾）weather has hit 104 cities in middle-east China lately makes citizens well aware of
______a terrible problem China is faced with.
| A．what | B．how | C．which | D．that |
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That hazy（雾霾）weather has hit 104 cities in middle-east China lately makes citizens well aware of
______a terrible problem China is faced with.
| A．what | B．how | C．which | D．that |
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