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----Jack, is maths difficult to learn in High school?

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----Jack, is maths difficult to learn in High school?
----Sure. No subject can be learned well __________hard work.
A.without B.through C.by D.with
----Jack, is maths difficult to learn in High school?
A

考查介词的用法。根据对话情景,答语中的意思是:肯定了数学在高中难学,而且补充说明哪门课程都需要刻苦学习才能学好。因为本句是个否定句,所以要用表示否定的介词without。