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Many people think English is ________ useful language．(填入适当的不定冠词)
在需要冠词的地方填入a, an或the, 在不需要冠词的地方划斜线
________ orange is ________ orange. It isn't red.
Are you all in ________ same school?
There are two pencils and ________ pen in the pencil-box.
用不定冠词填空
Last Sunday we had ________ good time．