We spent about one-third of our...
Câu hỏi: We spent about one-third of our lives sleeping. We know relatively little about sleep.
A. We know relatively little about sleep, as a result, we spend about one-third of our lives sleeping.
B. We shall know more about sleep if we spend more than one-third of our lives sleeping.
C. We spend about one-third of our lives sleeping so that we know relatively little about sleep.
D. Despite spending about one-third of our lives sleeping, we know relatively little about sleep.
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