题目

 It was said that other possibilities ________ at the meeting the day before yesterday. A. were never paid attention                         B. were never paying attention to C. never paid attention to                            D. were never paid attention to 答案：D pay attention to“注意到……”，在此用的是被动形式。never放在助动词后其他动词之前。______和______之间的关系，主要是吃与被吃的关系，这样就形成了______．而在一个生态系统中，它们往往是彼此交错连接的，这样就形成了______．