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A
is
B
are
C
have been
D
has been
正确答案 :D
解析
本题考查英语句法——谓语时态和主谓一致。
句意“来华求学的外国留学生的数量自从2000开始一直在稳定增长。”分析句子结构可知,设空处在句中作谓语。根据时间状语since可知,时间从过去一直延续到现在故此处可用现在完成时,主语The number of foreign students与谓语动词rise之间为主动关系,且主语为单数概念,has been doing为现在完成进行时,侧重强调动作从过去到现在一直持续的状态。D想符合题意。
A、B、C为干扰选项,不符合题意,故排除。
故本题答案为D。
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