问题
选择题
The number of foreign students attending Chinese universities ________ rising steadily since 1990.[ ]
A. is 
B. are
C. has been
D. have been
答案
答案：C
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The number of foreign students attending Chinese universities ________ rising steadily since 1990.[ ]
A. is
B. are
C. has been
D. have been
答案：C