－MayIspeaktoMr．Smith?－Iamafraidnot．Heisatameetingnow．It...

问题详情：

－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

【回答】

B

知识点：形容词

题型：选择题