is the engineers
are the engineers
the engineers is
the engineers are
本题考查主谓一致和倒装。what开头的疑问句，主语谓语要采用倒装形式，即疑问词+谓语+主语的格式。 engineers为复数，要用谓语的复数are。 句意：工程师们在新项目中扮演何种角色？
