组卷网 > 高中英语综合库 > 单词辨析 > W > what
题型:单项选择 难度:0.85 引用次数:387 题号:15811063
To improve learning efficiency, students must spend more time focusing on _________ they are weak in.
A.whatB.whereC.whenD.which
21-22高二下·天津·期中 查看更多[2]

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