—Mr. Wang __________ be in the office. The light is still on.

—No, he __________ be. Because he phoned me from the farm just now.

A．may; mustn’t

B．mustn’t; mustn’t

C．can’t; can’t

D．must; can’t

市场细分是现代市场营销观念的产物，又是市场营销组合策略运用的结果。