根据网考网考试中心的统计分析,以下试题在2019/1/21日托福考试习题练习中,答错率较高,为:56%
【单选题】 Insulin is manufactured by specialized cells in the pancreas and released ______ glucose reaches a certain concentration in the bloodstream.
A.(which
B.(whenever
C.(how
D.(during
网考网参考答案:B,答错率:56%
网考网试题解析:
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