Progress so far has been very good. , we are sure that the project will be pleted on time.
A. However
B. Otherwise
C. Therefore
D. Besides
网友回答
A. However
B. Otherwise
(答案→)C. Therefore
D. Besides
解析：本题考查副词的用法。however不管怎样；otherwise否则；therefore所以；besides除此以外。根据句意判断，前后两句为因果关系，故C项正确。