单选题
1.00分
Through doing this, the teacher will be able to ascertain the extent to __________the children under...
Through doing this, the teacher will be able to ascertain the extent to __________the children understand what they are reading.
参考答案: B
参考解析: 考查定语从句。主句为“the teacher will be able to ascertain the extent”，定语从句为“to the children anderstand what thev are reading”．先行词为extent．短语to…extent意思是“到……程度”。句意为“这样做，老师就能确定孩子们对他们所读的内容理解到什么程度了”。故选B。
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