问题
选择题
My sister has learnt English .
A．for twelve years ago
B．since she was four
C．twelve years ago
D．at the age of four
答案
答案：B
由谓语动词has learnt可知，应用表示一段时间的时间状语，A项表达错误；C、D两项用于一般过去时，故选B。
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