2. 外语
  3. When the A(concentration) of calcium in the blood is B(too) low, the parathyroid glands C(began) to D(secrete) the hormone parat

When the A(concentration) of calcium in the blood is B(too) low, the parathyroid glands C(began) to D(secrete) the hormone parat

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问题 When the A(concentration) of calcium in the blood is B(too) low, the parathyroid glands C(began) to D(secrete) the hormone parathormone.
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答案C
解析 began to secrete改为begin。主从句的时态保持一致。
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