—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 |
—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 |
试题篮
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