下列物质的性质中，属于化学性质的是                

A．铝具有导电性

B．碳酸氢钠能与稀盐酸反应

C．氯化钠是白色固体

D．常温下甲烷是无色无味气体

— I rang you yesterday afternoon. A man answered, but I didn't recognize the voice.

—  Oh, it ____ my uncle. He was in my room then. [      ]

A. should have been

B. should be

C. must have been

D. must be