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：句意，到目前为止，一切进展顺利。因此，我们确定工程可以按时被完成。However然而Otherwise否则Therefore因此Besides此外，根据题意，故选C。