The study of the effects of prolonged exposure to artificial light on the human circadian rhythm is a relatively new field, however, the results of these studies have already yielded interesting insights into the potential impact of artificial light on human health.
SAT · English · previous-year question
- A.The study of the effects of prolonged exposure to artificial light on the human circadian rhythm is a relatively new field, however, the results of these studies have already yielded interesting insights into the potential impact of artificial light on human health.correct
- B.The study of the effects of prolonged exposure to artificial light on the human circadian rhythm is a relatively new field, however, the results of these studies have already yielded interesting insights into the potential impact of artificial light on human health.
- C.The study of the effects of prolonged exposure to artificial light on the human circadian rhythm is a relatively new field, however, the results of these studies already yielded interesting insights into the potential impact of artificial light on human health.
- D.The study of the effects of prolonged exposure to artificial light on the human circadian rhythm is a relatively new field, however, the results of these studies are already yielding interesting insights into the potential impact of artificial light on human health.
Answer
A. The study of the effects of prolonged exposure to artificial light on the human circadian rhythm is a relatively new field, however, the results of these studies have already yielded interesting insights into the potential impact of artificial light on human health.
Explanation
The sentence should maintain a consistent verb tense. The first part of the sentence is in the present tense. Therefore, the second part should also be in the present tense. "Have already yielded" is correct because it maintains the present tense.
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