单项选择 较易0.85 引用1 组卷144
Pandas are facing danger！The situation won't change________humans stop killing.
| A．unless | B．though | C．if | D．after |
2021九年级·全国·专题练习
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You should search for some information and learn more about the rules ________ you visit the Science Museum.
| A．until | B．before | C．while | D．after |
She says that she'll have to close the restaurant ______ business improves.
| A．if | B．after | C．unless | D．when |
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