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 解析: 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。10．根据所学知识回答下列问题：（1）请解释铵态氮肥与碱性物质混合施用会降低肥效的原因．（2）用化学方程式表示“曾庆德铁则化为铜”的原理．