问题补充：
she seems to put on a smiling face every day, she hasn’t really got over the shadow of exam failure.
A. Because
B. As
C. Whether
D. While
答案：
A. Because
B. As
C. Whether
(答案→)D. While
解析：考查连词：A. Because因为B. As当…时候，因为，正如，C. Whether是否D. While当…时候，虽然，既然，句意：虽然她每天都是微笑的面容，但是她还没有克服考试失利的阴影。选D。
