Before writing your article， ______， collect your material， and prepare an outline.
A、a topic should be selected
B、a topic to be selected
C、your topic should be selected
D、select a topic
【正确答案】：D
【题目解析】：前后谓语动词要保持一致，collect 以及prepare 为动词原形，且为主动关系， 所以D 正确
