【单选题】

Mary spent the whole weekend in her room, for the coming examination.

A、locked; prepared
B、being locked; preparing
C、locked; preparing
D、locking; preparing

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根据网考网移动考试中心的统计，该试题：

0%的考友选择了A选项

3%的考友选择了B选项

89%的考友选择了C选项

8%的考友选择了D选项

Mary spent the whole weekend ______ in her room, ______ for the coming examination.