单项选择题

______ the enormous flow of food from the entire globe, these countries have for many years not felt any population pressure.

A．Thanks to
B．By means of
C．In line with
D．With regard to
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______ much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the realm of assumption.
A．Because
B．For
C．Since
D．While
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All the tasks ______ ahead of time, they decided to go on holiday for a week.
A．had been fulfilled
B．were fulfilled
C．having been fulfilled
D．been fulfilled
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