could, would, must; all, whole, bothWe ______have cleaned up ___

could, would, must; all, whole, both
We ______have cleaned up ______the mess before Mama see us.
【正确答案】：must /all
【题目解析】：Must 表示非推测意义时，意为“必须、一定要”，可用于肯定句、否定句或疑问句中；用于否定句时，mustn’t的意思是“一定不要、不能”。