题目

The number of foreign students attending Chinese universities ________ rising steadily since1990.   A. is                B. are                C. has been          D. have been     答案： C    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。  

查看本题答案和解析