英语高手帮忙解疑——菜鸟专线they have been collecting coins since 1998.的疑问句答案给的是have they been.have当“有”讲时不是才提前么

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英语高手帮忙解疑——菜鸟专线they have been collecting coins since 1998.的疑问句答案给的是have they been.have当“有”讲时不是才提前么
英语高手帮忙解疑——菜鸟专线
they have been collecting coins since 1998.的疑问句答案给的是have they been.have当“有”讲时不是才提前么

英语高手帮忙解疑——菜鸟专线they have been collecting coins since 1998.的疑问句答案给的是have they been.have当“有”讲时不是才提前么
你不是说了,是疑问句吗?疑问句当然提前啦.

have been是现在完成时态。

have当助动词时在疑问句中提前

是地