cost at least twenty pounds

The book cost her three pounds and twenty pence.为什么pound加s 而 The blouse cost her at least $200.=She __ at least $200 __ t 二个英语问题新概念2笔记中有这样一句话；The dress cost me twenty pounds.the dres it cost five hundred pounds at least ( )English well,you should read it at least twenty minutes a peter _________（read） at least twenty novels in the last ter at most &at least at least twice 和 twice at least at least与at the least 英语翻译at least news at least的同义词