They have studied English for 20 years. They began to study English _____.

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问题 They have studied English for 20 years. They began to study English _____.

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答案20 years ago

解析考查现在完成时和一般过去时转换。20年前开始，相当于已经学了20年。

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本试题收录于：公共英语一级笔试题库公共英语（PETS）分类

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