合金相图实验报告:这句为什么用had better ？而不用would rather？

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If Jack is as sick as you say,she________ go home.

这句话字面意思是：如果JACK像你所说的一样生病了，她最好回家。
would rather 是宁可、宁愿
had better是最好

had better 是“最好”的意思；would rather是“宁愿”的意思，多用would rather do sth than do sth.这句话的意思是：如果杰克病的像你说的那么严重，那他（she?)最好回家休息。

had better 的意思是最好，而would rather 的意思是宁愿，套在里面根本不通嘛

这句为什么用had better ？而不用would rather？ had better后面需要加to吗?为什么? had better ____ sth. You’had better go there on foot.（同义句转换） “YOU HAD BETTER”的缩略形式 you had better( )fire.it's dangerous. in advance、look up、had better、exactly是什么意思？ You had better go there on foot.(作否定回答) 英语4选1（should, had better, must, have）为什么这句不用提问how long 而用how far提问呢