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Metallurgy, the process of refining metals from naturally mi

This topic has 1 member reply

Metallurgy, the process of refining metals from naturally mi

Post Wed Sep 20, 2017 4:29 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Metallurgy, the process of refining metals from naturally mined ores, as a method of the moulding of metals, it was well known as early as the medieval period, but until about several decades ago workers did not realize that bacteria take an active part in the process.

    (A) as a method of the moulding of metals, it was well-known

    (B) as a method of the moulding of metals well-known

    (C) was a well-known method of metal moulding

    (D) was a well-known method of moulding metal that was

    (E) had been a method of metal moulding, well-known

    Is there any best approach to determine the answer?

    Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!
    Post Wed Oct 11, 2017 6:57 pm
    I think that the correct option is D. But I don't know how to give a good explanation of this.

    Any expert could help me. I'd really like an explanation here. Please.

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