The rate of racial progress varies in different areas of the

The rate of racial progress varies in different areas of the country, but in the past ten years _________ more improvement.
A.there is B.it is C.there have been D.there has been
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D

考察时态。In the past ten years与现在完成时连用,结合句意可知D正确。句意:在过去十年中,已经有了更多的进步。

1年前

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