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The number of foreign students attending Chinese universities _____ rising steadily since 1990.   
A.isB.areC.has beenD.have been
C

试题分析:考察时态。本题的关键词是后面的since 1990自从1990年以来;该时间状语经常与现在完成时连用。句意:自从1990年以来到中国大学的学生的数量一致在稳定地上升。故C正确。
点评:时态题的考查关键是抓住句子的上下文含义和句中的时间状语。要根据时间状语来选择合适的时态,在平时的学习中要注意积累有关时态的用法和各种时态的特殊之处。如since, so far等经常与现在完成时连用。在条件状语从句中用一般现在时代替将来时等等。
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