D

available. (="capable" of being used; that may be obtained) 可用的, 有效的, 可得到的。例如：1) There are no doctors available in the remote areas. (在边远地区没有大夫。) 2) There tickets are available for on month. (这些票有效期一个月。)

acceptable 可以接受的：None of the suggestions was acceptable. advisable 明智的, 可取的, 适当的：I think it advisable that he be assigned to the job. (我认为指派他干这项工作是可取的。) adaptable 能适应的：He is an adaptable man and will soon learn the new work.