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

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

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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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