— May I speak to Mr Smith? — I am afraid not. He is at a meeting now. It’s not .A. reliabl

问题补充：

— May I speak to Mr Smith?

— I am afraid not. He is at a meeting now. It’s not .

A. reliable

B. convenient

C. beneficial

D. available

答案：

A. reliable

(答案→)B. convenient

C. beneficial

D. available

解析：A reliable可靠的， B. convenient 便利的，C. beneficial有益的，D. available 可获得的，句意：--我可以和史密斯先生说话吗？--恐怕不能，现在他在开会，不方便。所以选B。