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

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