Test: SAT Writing

Replace the underlined portion with the answer choice that results in a sentence that is clear, precise, and meets the requirements of standard written English.

1.

Since the advent of the original flu vaccine, they have discovered several additional drugs that, when administered by a health care professional, help to reduce the risk of influenza.

researchers have discovered several additional drugs that, when administered by a health care professional, helps in reducing the risk of influenza. 

researchers have discovered several additional drugs that, when administered by a health care professional, has helped to reduce the risk of influenza. 

they have discovered several additional drugs that, when administered by a health care professional, help to reduce the risk of influenza. 

researchers have discovered several additional drugs that, when administered by a health care professional, help to reduce the risk of influenza. 

they have discovered several additional drugs that, when administered by a health care professional, helps to reduce the risk of influenza. 

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