组卷网 > 高中英语综合库 > 语法 > 句法 > 固定句型
题型:单项选择 难度:0.64 引用次数:124 题号:3145079
He is so busy with the research _____ he has no time left for any other activity.
A.whichB.thatC.whyD.Because
【知识点】 固定句型

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