how long和when用于提问现在完成时的区别多举几个例子

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• how long和when用于提问现在完成时的区别多举几个例子
• since 和 when在现在完成时中的区别比如 I have been skating since I was7 years old 为何不能用when 什么时候用when多举几个例句 然后分别说明主句从句接什么时态别复制长帖子 3Q
• how long和when用于提问现在完成时的区别
• Sally is said _____ in a foreign company,but I have no idea which company she worked in.A.to have worked B.to work C.to be working D.to have been working 额.你的英语..是现在完成时.所以是is said
• All that can be done___________A.has done B.has been done C.have done D.have been done 请选入合适的选项.并解释原因,