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)
How many pens are there in the pencil-case
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