Our class adviser doesn’t doubt，in any case. .we can overe the difficulties in our study.Healways gives us a confident smile.
A. how
B. whether
C. that
D. why
网友回答
A. how
B. whether
(答案→)C. that
D. why
解析：C【点拨】not doubt后面的宾语从句需用that引导.以表达确定的枣情。决定成为，决定去做……；A项不满足的；B项吃惊的；D项泄气的。