有关倒装的选择 ------,our experiment wounld have faildeda if they didn't help usb.if they haven't helped us c.had they noy helped usd.should they not helped us我想知道b d 哪里错了?

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有关倒装的选择 ------,our experiment wounld have faildeda if they didn't help usb.if they haven't helped us c.had they noy helped usd.should they not helped us我想知道b d 哪里错了?
有关倒装的选择 ------,our experiment wounld have failded
a if they didn't help us
b.if they haven't helped us
c.had they noy helped us
d.should they not helped us
我想知道b d 哪里错了?

有关倒装的选择 ------,our experiment wounld have faildeda if they didn't help usb.if they haven't helped us c.had they noy helped usd.should they not helped us我想知道b d 哪里错了?
选c,因为if省略了
这句话是虚拟语气
用b,要把haven’t 改成hadn't 才行,因为是与过去事实相反的假设, 从句重要用过去完成时,主句中要用would等情态动词加现在完成时
d, 你看一下,用should的话能用helped 么
这么说希望你明白了

should和have后helped的应为原形help

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