| 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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