题目内容：
15. As the smallest child of his family, Alex is always longing for the time he should be able to be independent.
A．which B．where
C．whom
D．when
参考答案：
答案解析：
单选题：15. As the smallest child of his family, Alex is always lon
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- 题目类型：单选题
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B．where
C．whom
D．when