Question

【题目】A German company has developed a rapid test. (改为被动语态)

A rapid test __________ __________ developed by a German company.

Answer 1

【答案】has been

【解析】

句意：一个德国公司已经开发了一个快速的测试。

根据has developed可知是现在完成时态；a rapid test做主语，是单数名词，谓语动词用第三人称单数形式；谓语动词变成被动形式has been developed。故答案为has been。