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    19、________ melamine（三聚氰胺）to milk makes the protein level appear higher, which brings a quick profit to some greedy companies.

    A. Added                   B. Having added           C. Being added             D. Adding

    19、D

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    ________ melamine（三聚氰胺）to milk makes the protein level appear higher, which brings a quick profit to some greedy companies.

    A. Added                   B. Having added           C. Being added             D. Adding

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