helen_London without informing me and she_for several months.A has left ...was awayB left .has been away但我错选A 想问选择B的原因是什么呢

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helen___London without informing me and she___for several months.A has left ...was awayB left .has been away但我错选A 想问选择B的原因是什么呢
helen___London without informing me and she___for several months.
A has left ...was away
B left .has been away
但我错选A 想问选择B的原因是什么呢

helen___London without informing me and she___for several months.A has left ...was awayB left .has been away但我错选A 想问选择B的原因是什么呢
这句话的意思是海伦没有通知我就离开了伦敦,到现在走了都几个月了.have done 是现在完成时,was是过去式.那是不是她离开已经是过去的事了,要用过去式；而离开了这么久是到现在为止,都保持在离开这个状态,所以用现在完成时.

从 and 可以看出前后为两个并列的句子，且后面这个句子的动作发生在前面句子的动作之前，所以后面的句子应该用现在完成时态，前面的句子要用过去时态。SORRY，and前面有逗号还有为何用left,说这句话时Helen不是已经离开了吗是的，说这句话时Helen不是已经离开了，所以用left...

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从 and 可以看出前后为两个并列的句子，且后面这个句子的动作发生在前面句子的动作之前，所以后面的句子应该用现在完成时态，前面的句子要用过去时态。

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B
有明确for..（一段时间）的时间状语前用现在完成时，而且动作要用延续性的，因此是has been away，强调的是过去发生的动作对现在的影响（离开了多少时间）
前一个未通知我就离开伦敦，明显是过去作的动作，用一般过去时

helen left London without informing me 陈述过去发生的事情，所以用过去式，left
and she___for several months 表示过去已经发生的事情她已经离开有几个月了用过去完成时

B left ....has been away
有明确for..（一段时间）的时间状语前用现在完成时，而且动作要用延续性的，因此是has been away，强调的是过去发生的动作对现在的影响（离开了多少时间）
前一个未通知我就离开伦敦，明显是过去作的动作，用一般过去时

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句子中带for 和since的用于现在完成时，结构：主语+have+done.
for 加一段时间， since加一个时间点或者一个句子
eg: I have known Sally for 2 years.
I have known Sally since 2010./ since she came to my school.
此句中，for后加了一段时间 several moths（几个月），因此后面这句应该用现在完成时。
前面的句子强调的是过去发生的事情，因此用过去时。

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首先后半句的意思是，到现在为止，她已经离开数月了。过去发生的动作对现在产生的影响，所以用现在完成时，has been away;
前者表示过去发生的一个动作，且这个动作在has been away 之前。所以用一般过去时。
需要注意的是，正因为有了他离开这个动作，才有了她到现在为止离开数月的事件。
所以在后边是过去时的情况下，前边是不可能用现在完成时的。
希望回答对...

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