Through doing this, the teacher will be able to ascertain the extent to __________the children understand what they are reading.
题目内容(请给出正确答案)
Through doing this, the teacher will be able to ascertain the extent to __________the children understand what they are reading.
A．how ?
B．which
C．that ?
D．what
参考答案和解析
答案：B
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。
