His younger sister may already be in high school now, in ___ case this picture book is too childish ...
2022-12-16 13:49:51 164次 2012-2013学年甘肃省高三第五次诊断考试英语卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
His younger sister may already be in high school now,
in ___ case this picture book is too childish for her.
A．that B．which C．whose D．what
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