When the Aconcentration of calcium in the blood is Btoo low, the parathyroid gla

游客2025-03-29 6

问题 When the Aconcentration of calcium in the blood is Btoo low, the parathyroid glands Cbegan to Dsecrete the hormone parathormone.

选项 A、
B、
C、
D、

答案 C

解析 began改为begin。主、从句的时态保持致。

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