题目内容：
It is believed that children of two or three years old are able to learn any language if they are __________ it.
A．involved in B．indulged in
C．disposed to
D．exposed to
参考答案：
答案解析：
单选题：It is believed that children of two or three years old are a
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B．indulged in
C．disposed to
D．exposed to