两道英语题目,帮忙解答一下.1."Not until science became prominent _ abolished."_英语解答

两道英语题目,帮忙解答一下.
1."Not until science became prominent _ abolished." some people argue.
a.did slavery come to b.had slavery come to
为什么选a
2.Unless _ he wouldn't do it.
a.be urged b.urged
为什么选b
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人气：289 ℃　时间：2020-04-11 09:32:44

解答

1.这句句子正确的语序是Not until did slavery come to abolished,science became prominent.如果选B,那整句句子都要是过去完成时.遵循主句从句时态一致的原则,我们选A.
2.选A的话要改成是being urged,从句没主语