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The number of foreign students attending Chinese universities ________ rising steadily since1990. 
A．isB．areC．has beenD．have been
C 
句意：到中國上大學的外國學生的數(shù)量自從1990年以來逐年增加。本題考查主謂一致和時態(tài)，主語是 the number故謂語動詞用單數(shù)，又因時間狀語是since 1990所以用完成時態(tài)。
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