Insulin is manufactured by specialized cells in the pancreas and released ______

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问题 Insulin is manufactured by specialized cells in the pancreas and released ______ glucose reaches a certain concentration in the bloodstream.

选项 A、which
B、whenever
C、how
D、during

答案 D

解析

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Insulinismanufacturedbyspecializedcellsinthepancreasandreleased______