题目

—Do you think we should accept that offer? — Yes, we should, for we ___such bad luck up till now, and time __ out. A．have had; is running              B．had; is running C．have; has been run                D．have had; has been run 答案：A 解析: 略11．萝卜贮存久了就会空心，这是因为萝卜内贮存的大量有机物被分解利用了，这与植物的呼吸作用有关．