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To improve learning efficiency, students...

To improve learning efficiency, students must spend more time focusing on the skills__________ they are weak in.

A.what B.where C.when D.which

 

D 【解析】 考查定语从句关系词。分析句子结构可知,句子“they are weak in”是定语从句,修饰先行词the skills,先行词指事物,在从句中充当介词in后面的宾语成分,需用关系词which。故选D。
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