关于药物制成混悬剂的条件的正确表述有（）

A.难溶性药物需制成液体制剂供临床应用时

B.药物的剂量超过溶解度而不能以溶液剂形式应用时

C.两种溶液混合时药物的溶解度降低而析出固体药物时

D.毒剧药或剂量小的药物不应制成混悬剂使用

E.需要产生缓释作用时

When he saw all his books _____ here and there on the floor, he knew that something terrible _____.

A．lying; must have happened

B．lie; must happen

C．lay; might have happened

D．had lain; could have happen