---The air pollution is terrible.
--- It will be worse we take action to protect the environment.
| A．if | B．unless | C．so | D．though |
相关试题
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—_______________.
—That sounds great.
| A．Let’s stay at home and watch TV. |
| B．Do you like playing games? |
| C．Is it OK with you? |
| D．How are you? |
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