glad you've come back from thailand.please tell me how long

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/07/25 20:32:34

glad you've come back from thailand.please tell me how long you(have stayed) there
答案给的是：have stayed
为什么have stayed?而不是stayed,或had stayed?

how long后面一定要跟延续性的完成时!
而stay本身就是延续性的动词!
STAYED是过去时,必须有过去的某个时间才能用!
HAD STAYED是过去完成,必须表明是在过去的过去才行!而这里是现在的过去!
明白了吧!

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