The number of foreign students attending Chinese universities rising steadily since1990. 21世纪教育网
A. is
B. are
C. has been
D. have been 21世纪教育网
网友回答
A. is
B. are
(答案→)C. has been
D. have been 21世纪教育网
解析：本题考查主谓一致和时态，主语是 the number故谓语动词用单数，又因时间状语是since 1997所以用完成时态。