2. 外语
  3. Insulin is manufactured by specialized cells in the pancreas and released ______ glucose reaches a certain concentration in the

Insulin is manufactured by specialized cells in the pancreas and released ______ glucose reaches a certain concentration in the

admin2004-12-28  60
问题 Insulin is manufactured by specialized cells in the pancreas and released ______ glucose reaches a certain concentration in the bloodstream.
选项 A、which
B、whenever
C、how
D、during
答案D
解析
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