He said the most unusual aspect of the Mexican trial was that the 12 teenagers were not given any drags to suppress their immune

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问题 He said the most unusual aspect of the Mexican trial was that the 12 teenagers were not given any drags to suppress their immune systems, ______ would normally destroy any cells from other animals.

选项 A、at which
B、which
C、to which
D、as

答案B

解析
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