组卷网 > 初中英语综合库 > 短语辨析 > B > be busy (in) doing sth.
题型:单项选择 难度:0.85 引用次数:110 题号:11995172
—Where is Mary?
—She’s busy ______ for the exams.
A.studyB.studiesC.studyingD.to study

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