Our teacher always speaks slowly and clearly in class .A. so as to be understoodB. to hav

问题补充：

Our teacher always speaks slowly and clearly in class .

A. so as to be understood

B. to have understood

C. so as to understand

D. to understand

答案：

(答案→)A. so as to be understood

B. to have understood

C. so as to understand

D. to understand

解析：考查固定搭配。so as to do sth=in order to do sth为了做某事，Our teacher和understand之间是动宾关系，即“老师被同学们理解”，故使用被动语态，排除B、C、D，故选A。