The rate of racial progress varies in different areas of the country, but in the past ten years _________ more improvement.
A．there isB．it isC．there have beenD．there has been
D
考察時態(tài)。In the past ten years與現(xiàn)在完成時連用，結(jié)合句意可知D正確。句意：在過去十年中，已經(jīng)有了更多的進(jìn)步。
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