| Idx | 1549 |
|---|---|
| Keyword | knock |
| Sub Entry Number | 2 |
| Type of Sentence | ✗ |
| Error Sentence | When Sandra knocked the door, he was washing his face. |
| Correct Sentence | When Sandra knocked on the door, he was washing his face. |
| Cloze Error Sentence | When Sandra knocked [[ ]] the door, he was washing his face. |
| Cloze Sentence | When Sandra knocked [[on]] the door, he was washing his face. |
| Cloze Answer | on |
| Choices | _ | on |
| Explanation | knock on/at a door, window etc: 'In future, don't come in without knocking on the door.' |
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