Question

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

Answer 1

B

考查现在完成时的时间状语。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，所以答案选择B。