题文
Plastic bags are provided for our convenience but they also have __________ the pollution of the environment.
| A．referred to |
| B．led to |
| C．reacted to |
| D．attended to |
推荐试卷
Plastic bags are provided for our convenience but they also have __________ the pollution of the environment.
| A．referred to |
| B．led to |
| C．reacted to |
| D．attended to |
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