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.

admin2020-03-30  29
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。
转载请注明原文地址:https://kaotiyun.com/show/N1TO777K
0

考博英语

相关试题推荐
随机试题
最新回复(0)