问题补充：
--- What do you think about the new teacher?
--- the new teacher is an elegant lady, she can be extremely difficult to work with.
A. As if
B. As long as
C. Because
D. While
答案：
A. As if
B. As long as
C. Because
(答案→)D. While
解析：从句意看,这位新老师举止优雅，却特别难以相处。前后呈转折关系。连词While除“与……同时”之意外，还有“虽然、尽管”之意，所以选D。
