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【单选题】

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

B.(whenever
C.(how
D.(during
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19%的考友选择了A选项

60%的考友选择了B选项

11%的考友选择了C选项

10%的考友选择了D选项

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