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◆◆◆两道语法题1、Man will eventually become more and more able to d

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◆◆◆两道语法题
1、Man will eventually become more and more able to deal with the destruction of a potential earthquake ____ it occurs.
A.once B.before
都已经要deal with the destruction了,地震都发生了怎么还用before?
2、There are still some backward towns on the edge of the modern city,____ they were on the edge of 17th century London and early 19th century Paris.
A.as though B.just as
求A、B两个选项的细微差别.
1.我的理解是在震前做一些预防措施,可以极大程度上地震带来的毁坏.所以用before
2.个人分析,不是非常确定.之所以不能用just as吗,因为它接名词,比如
You should take an umbrella just as a precaution.
你该带把伞,有备无患.
而且这句话里just as 不如 as though 贴切.
而as though(好像)可以接从句.