题目

.（2010·安徽两地三校高10月联考）       22. --- Do you still remember when we went to Nanjing? --- I can’t remember now but _________ sometime last summer? A. might it be                B. could it be C. could it have been          D. should it have been 答案：C6．下列日用器具中利用连通器原理工作的是（　　）A．洗手池的排水管B．钢笔吸水C．胶头滴管D．液体压强计