- Air_______ is one of the biggest problems in the world today
- Yes. We must take action to make the air less_______.
| A．pollution; pollution | B．pollute; pollution |
| C．pollution; pollute | D．pollution; polluted |
相关试题
- Air_______ is one of the biggest problems in the world today
- Yes. We must take action to make the air less_______.
| A．pollution; pollution | B．pollute; pollution |
| C．pollution; pollute | D．pollution; polluted |
B. 
C. 
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