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  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。

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