◎ 题干
Betty and Hector _______ at Beijing International School _______ last year. 
[     ]
A. are, since    
B. have been, for  
C. has been, since  
D. have been, since
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Betty and Hector __________ at Beijing International School __________ last year.[ ]A. are, sinceB. have been, forC. has been, sinceD. have been, since…”主要考查了你对  【现在完成时】【介词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。