短语词组短语be an open book 率直的人an open book exam 开卷考试talk like an open book 毫不隐瞒地讲话i am an open book 我是一本打开的书to be an open book 意指一目了然的事An open -book exam 开卷考试i 'm an open book 我知无不言I 'm an open book instead 然而我已覆水难收 返回 an open book