，让鸽子成为世界上数量最多的鸟。【分析】本节中获得whe
引导的是一个时间状语从句。同时句中的现在分词短语maki
gitperhapsthemostabu
da
tbirdi
theworld充当的是结果状语，表示意料之中的结果。当鸽子的数量达到了30亿只，毫无疑问它是世界上数量最多的鸟。不定式做结果状语时，常常表示意料之外的结果。2I
1897thestateofMichiga
passedalawprohibiti
gthekilli
gofpasse
gerpigeo
sbutbythe
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see
i
thestatefor10years【翻译】在1897年，密西根州通过了一项法律，禁止人们捕杀鸽子。但是十年以后在这个州也没有看见大规模的鸽群。【分析】本句中的现在分词短语prohibiti
gthekilli
gofpasse
gerpigeo
s作为定语修饰名词alaw；因为动词prohibite与名词alaw之间构成主动关系，所以使用现在分词做定语。后半句中的bythe
中的by到…时，经常与完成时连用，如果与过去的时间连用，则使用过去完成时。本题中的the
是过去的试卷，所以后面使用了hadbee
。
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