炉膛耐火材料施工完毕后，要自然干燥（）天。
A、3
B、4
C、5
D、2
参考答案：C
To test eggs, _______ them in a bowl of water: if they float they’re bad, if they sink they’re good.
A．put
B．putting
C．to put
D．to be putting
絪缊
