2. 外语
  3. They have studied English for 20 years. They began to study English _______.

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 _______.
选项
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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