划线部分提问 There is a pen in the pencil-case.(划线部分是a)
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![划线部分提问 There is a pen in the pencil-case.(划线部分是a)](/uploads/image/z/5806785-57-5.jpg?t=%E5%88%92%E7%BA%BF%E9%83%A8%E5%88%86%E6%8F%90%E9%97%AE+There+is+a+pen+in+the+pencil-case.%28%E5%88%92%E7%BA%BF%E9%83%A8%E5%88%86%E6%98%AFa%29)
划线部分提问 There is a pen in the pencil-case.(划线部分是a)
划线部分提问 There is a pen in the pencil-case.(划线部分是a)
划线部分提问 There is a pen in the pencil-case.(划线部分是a)
How many pens are there in the pencil-case