◎ 题干
— I'm going to the States.
— How long _____ you _____ in the States?
[     ]
A. are; stayed
B. are; staying
C. have; stayed
D. did; stay
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“— I'm going to the States. — How long _____ you _____ in the States? [ ]A. are; stayed B. are; staying C. have; stayed D. did; stay …”主要考查了你对  【现在进行时】  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。