---Will you be this evening, Mary?
---That depends. I am afraid I will be with my manager together discussing a plan.
A. convenient
B. suitable
C. available
D. efficient
网友回答
A. convenient
B. suitable
(答案→)C. available
D. efficient
解析：考查形容词。convenient 方便的，suitable 合适的available 可利用的，方便的，有空的efficient有效率的 “你晚上有空吗？”