The number of foreign students attending Chinese universities ________ rising steadily since1990.  
A．isB．a(chǎn)reC．has beenD．have been
C
本題考查主謂一致和時(shí)態(tài)，主語是 the number故謂語動詞用單數(shù)，又因時(shí)間狀語是since 1997所以用完成時(shí)態(tài)。
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