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Virologists, having learned an enormous amount during the last two dec

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Director
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Joined: 27 Oct 2018
Posts: 821
Location: Egypt
Concentration: Strategy, International Business
GPA: 3.67
WE: Pharmaceuticals (Health Care)
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Virologists, having learned an enormous amount during the last two dec  [#permalink]

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New post 06 Dec 2019, 00:00
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82% (01:07) correct 18% (01:08) wrong based on 62 sessions

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Virologists, having learned an enormous amount during the last two decades about HIV/AIDS and its devolution from a fatal to manageable disease, are now learning more details about how the virus changes and how patients transmit the disease.

A) Virologists, having learned an enormous amount during the last two decades about HIV/AIDS and its devolution from a fatal to manageable disease, are

B) Virologists, having learned an enormous amount during the last two decades about HIV/AIDS and its devolution from a fatal to manageable disease, and are

C) Virologists learning an enormous amount about HIV/AIDS and its devolution from a fatal to manageable disease during the last two decades, and are

D) Virologists have learned an enormous amount during the last two decades about HIV/AIDS and its devolution from a fatal to manageable disease,

E) Virologists have learned, during the last two decades, an enormous amount about HIV/AIDS and its devolution from a fatal to manageable disease,

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Re: Virologists, having learned an enormous amount during the last two dec  [#permalink]

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New post 09 Dec 2019, 07:58
can anyone explain me the use of 'having' ? when do we use having nd hoe the 'having' is used in this context ?
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Re: Virologists, having learned an enormous amount during the last two dec   [#permalink] 09 Dec 2019, 07:58
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Virologists, having learned an enormous amount during the last two dec

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