They said at last that they _______ better start out at once

问题描述:

They said at last that they _______ better start out at once
A.had had B.had C.had been D.was 是哪一个为什么?

had had better表示"最好" had better 相当于一个助动词,它只有一种形式,它后面要跟动词原形.had better do sth had better not do sth It is pretty cold.You'd better put on my coat.She'd better not play with ...