问题
选择题
Nancy hasn’t begun on her PH.D ________ working on her master’s degree.
A. still because she is yet
B yet as a result she is still
C yet because she is still
D still while she is already
答案
答案：C
because引导原因状语从句，yet是副词，“然而，而”，still 是副词，“仍然，还”。
