The number of foreign students attending Chinese universities ________ rising steadily since1990. 
A.isB.a(chǎn)reC.has beenD.have been
句意:到中國上大學(xué)的外國學(xué)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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