Process so far has been very good we are sure that the project will be completed on time．

问题补充：

Process so far has been very good．，we are sure that the project will be completed on time．

A. However

B. Otherwise

C. Therefore

D. Besides

答案：

A. However

B. Otherwise

(答案→)C. Therefore

D. Besides

解析：副词辨析。A然而；B否则，要不然；C因此；D而且；句意：到目前为止，一切进展得很好，因此我敢确信这项工程会准时完成。根据句意说明C正确。