情态动词填空,很大一部分是更据句意的.
就如此题 句意是：老师要求学生不应该触碰任何实验室的试管.
shouldn't 表示原则上不应许
couldn't 表示能力上不应许
比方说 Jim couldn't touch the tube.是够不到 不是不允许.
故此题应选D .
The teacher requested that his students ___
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