13、Migrant workers may bring about some negative impacts. They contribute greatly to the development of the cities,      .

A.yet    B.a(chǎn)lthough    C.though      D.either

13、C

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Migrant workers may bring about some negative impacts. They contribute greatly to the development of the cities,      .

A.yet    B.a(chǎn)lthough    C.though      D.either

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