几道英语题1.They are quiet,aren't they? YEs.They are accustomed__

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几道英语题
1.They are quiet,aren't they?
YEs.They are accustomed_______at meals.
A.to talk B.to not talk
C.to talking D.to not talking
2.An opportunity is something that,________,by no means will you get back.
A.if you lose B.when lose
C.once lost D.after losing
帮忙解释一些,O(∩_∩)O谢谢

1.D2.C
1.not doing这是动名词的否定形式.be accustomed to doing为固定句型后边接动名词
2a项lose为及物动词后便需跟it才行.b.d两项容易排除,c项表示“一旦你失去了”是once it is lost 的省略形式
常见的题中还会遇到once begun 这种形式

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