| Id | 2128 |
|---|---|
| Category | Adverbial clauses and conjunctions |
| Unit | Unit 86: If … not and unless; if and whether; etc. |
| Rubric | Complete the sentences. Choose the correct or more natural option. If both options are correct, choose both. |
| Question | Don't drink the river water if you haven't / unless you have boiled it first. |
| Choices | if you haven't;unless you have |
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