if you are catching a train,you__comfortably early than.A.will be better to beB.had better be 这句话中为什么选b,不选A

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if you are catching a train,you__comfortably early than.A.will be better to beB.had better be 这句话中为什么选b,不选A
if you are catching a train,you__comfortably early than.A.will be better to be
B.had better be
这句话中为什么选b,不选A

if you are catching a train,you__comfortably early than.A.will be better to beB.had better be 这句话中为什么选b,不选A
主句的主要成分是 you … be early , 副词 comfortably（不慌不忙地/轻轻松松地）是修饰early 的程度状语.如果句中没有 than,动词原形 be 前可既以用表示将来的助动词 will,也可以用 had better,should,must,have to.由于than 的存在,只能用下面的几种情况表述：

you will be earlier than … 【你要比…更早一些】
you must be earlier than … 【你必须要比…更早一些】
you should be earlier than … 【你应该比…更早一些】
you have to be earlier than … 【你得比…更早一些】

上面的句子必须用 early 的比较级,但像 had better 和 would rather 中的 better 和 rather 的特殊后缀 er,因此可以直接用在 than 结构中,early 用原形即可：

you had better be early than … 【你最好要比…更早一些】

本句的意思是“你最好更加轻松地早一些动身”.be better 表示“更加健康”,如果用will be better to be early,意思就成了“你会更加健康地早一些动身”.

注：表示提出建议的 had better,只有保留 had 或用它的缩写形式‘d 才能被接受；will be better 不能表示这种建议概念.

因为是假设句" If ..." , 所以一定用假设语气的 " had better be... ".

在这里如果用A选项的话意思是说你愿意在几点钟到达火车站。在这里will是助动词，是愿意的意思。而去乘火车不是意愿问题，而是要按照列车时刻表，最好在发车前一小时达到乘车点，所以要选had better.

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