They have studied English for 20 years. They began to study English______.20 yea

游客2025-06-27 18

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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