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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.
admin
2020-03-30
58
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.
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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0
考博英语
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