how many is it 还有they is three yuan 和they are not to sale有什么错误

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• ---How is that,Joan?---Yeah,it's from the boss.She ( ) first whether she likes it.A．shall go B.ought to have gone C.should go D.must have go 请讲详细点选哪个还有为什么不能选CAC应该都可以表“应该”嘛但麻烦讲一下为什么不选其他的，THANKS!还有could have done和might have done都有本可以做而没做成的意思，那么二者有什么区别呢？比如这个题---John saw a three-year-old cjild walking alone in a sjopping mall,so he took the child home immediately and called the police.---But he_____have waited withthe child until the parents returned.A.sh
• how many is it 还有they is three yuan 和they are not to sale有什么错误
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