批改Yang Ling的作业，对的打“√”，错的画出错误并纠正。
1. a trousers
_______________      
2. an belt
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3. Can I help your?
_______________      
4. What could you like?
_______________
5. A: What colour is it? B: Twenty yuan.
_______________

【考点】不定冠词（a，an）,人称代词,形容词,情态动词,量词

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