The number of foreign students attending Chinese universities rising steadily since1990.
A. is
B. are
C. has been
D. have been
网友回答
A. is
B. are
C. has been
D. have been
解析：句意：到中国上大学的外国学生的数量自从1990年以来逐年增加。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 1990所以用完成时态。