Through doing this, the teacher will be able to ascertain the extent to______ the children understand what they are reading.

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问题 Through doing this, the teacher will be able to ascertain the extent to______ the children understand what they are reading.

选项 A、how
B、which
C、that
D、what

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 understand what they 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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