◎ 题干
—Look, there _____ many birds around here, but now we seldom see them. What a pity!
—Yeah! The air pollution has caused the problem!
[     ]
A. are
B. used to have
C. used to be
D. use to have
◎ 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“—Look, there _____ many birds around here, but now we seldom see them. What a pity! —Yeah! The air pollution has caused the problem! [ ]A. are B. used to have…”主要考查了你对  【动词短语】  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。