| Idx | 0913 |
|---|---|
| Keyword | during |
| Sub Entry Number | 1 |
| Type of Sentence | ✗ |
| Error Sentence | It is difficult to concentrate during such a long time. |
| Correct Sentence | It is difficult to concentrate for such a long time. |
| Cloze Error Sentence | It is difficult to concentrate [[during]] such a long time. |
| Cloze Sentence | It is difficult to concentrate [[for]] such a long time. |
| Cloze Answer | for |
| Choices | during | for |
| Explanation | During answers the question 'When?': 'During her stay here, she made a lot of good friends.' For answers the question 'How long?': 'I've been learning English for two years.' 'We've been waiting here for almost an hour.' |
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