| Id | 1308 |
|---|---|
| Category | Relative clauses and other types of clause |
| Unit | Unit 53: Relative pronouns |
| Rubric | Complete the sentences. Choose either the relative pronoun or the relative pronoun inside brackets if the sentence is correct both with and without it. |
| Question | It's a kind of safety valve which opens automatically when the pressure gets too high. |
| Choices | which;(which) |
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