试题题干
"That’s because Congress has always expected joint federal-state immigration enforcement and encourages state officers to share information and cooperate with federal colleagues."中的表语是（ ）。
参考答案
正确答案：
试题解析
句意：这是因为国会一直期待着联邦和各州联合执法移民，并鼓励各州官员分享信息，与联邦同事合作。
题干句子中的主语是that，系动词是is，表语是because Congress has always expected joint federal-state immigration enforcement and encourages state officers to share information and cooperate with federal colleagues。