帮忙分析一道题,谢谢!As you can imagine,I haven't been invited back ____.a.since b.though c.anyhow d.forever中文是什么!选哪个?为什么?

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帮忙分析一道题,谢谢!As you can imagine,I haven't been invited back ____.a.since b.though c.anyhow d.forever中文是什么!选哪个?为什么?
帮忙分析一道题,谢谢!
As you can imagine,I haven't been invited back ____.
a.since b.though c.anyhow d.forever
中文是什么!选哪个?为什么?

帮忙分析一道题,谢谢!As you can imagine,I haven't been invited back ____.a.since b.though c.anyhow d.forever中文是什么!选哪个?为什么?
As you can imagine,I haven't been invited back ____.
a.since
你也可以想像得到了, 我从未被邀请回来.
前半句是完全无问题的, 我猜你不明白的地方在后半句, 因为then一词"隠形"了.
这里,not...since的意思同never相似, 只是放的位置有别. 也就是说后半句完整地应写成I haven't been invited back since then, 也可写成I have never been invited back.
以下是since的其中一种用法:
adv.
[和完成时连用](=since then)以后, 后来, 以来
以前(=ago)
I have not seen him since.
(那时)以后我没见到过他.