You'd better call him up right away.（改为同义句） You'd better ___ ___ ___ right away.You'd better call him up right away.（改为同义句）You'd better ___ ___ ___ right away.
问题描述：
You'd better call him up right away.（改为同义句） You'd better ___ ___ ___ right away.
You'd better call him up right away.（改为同义句）
You'd better ___ ___ ___ right away.
答
ring him up：短语，给......打电话
答
call up him
一样的意义。
答
改为you'd better ring him up right away.
因为call sb up=ring sb up.都是给某人打电话的意思.
另外再给你延伸一下：call/ring sb 也可以.省略up意思是一样的.