The number of foreign students attending Chinese universities _____ rising steadily since 1997.
A．isB．a(chǎn)reC．has beenD．have been
C
考查時(shí)態(tài)和主謂一致。The number of…的數(shù)量；作主語時(shí)，謂語動(dòng)詞用單數(shù)。根據(jù)后面的since，可知使用現(xiàn)在完成時(shí)。
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