| Id | 2142 | 
|---|---|
| Category | Adverbial clauses and conjunctions | 
| Unit | Unit 86: If … not and unless; if and whether; etc. | 
| Rubric | Complete the sentences. Choose whether or if / whether if both words are possible. | 
| Question | It is not known if / whether he shares his brother's views. | 
| Choices | whether;if / whether | 
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