用am is are have has thereis thereare 填空:What ( ) this It ( ) a notebook.

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用amisarehavehasthereisthereare填空:What()thisIt()anotebook.用amisarehavehasthereisthereare填空:What()this

用am is are have has thereis thereare 填空:What ( ) this It ( ) a notebook.
用am is are have has thereis thereare 填空:What ( ) this It ( ) a notebook.

用am is are have has thereis thereare 填空:What ( ) this It ( ) a notebook.
is
is
Whoever did this to you made one hell of a mistake.

What (is ) this ? It (is ) a notebook.

is is