题目

Why didn't you tell me there was no meeting today? I________ all the way here through the heavy snow. A. needn't have driven            B. can't have driven C. mustn't have driven            D. shouldn't have driven   答案：Aneedn't have done意为“本来不需要”；D为“本来不应该”。某固态物质受热后变为气态物质，这种变化一定属于物理变化吗？请举例说明．