—Look, there_____ many birds around here, but now we hardly see them. What a pity! —Yeah! The air pollution has caused the problem!

题型：单选题题类：常考题难易度：普通

—Look, there_____ many birds around here, but now we hardly 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 be

举一反三

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