Process has been very smooth. , we are not confident that it will be pleted on time.
A. Therefore
B. Besides
C. Though
D. However
网友回答
A. Therefore
B. Besides
C. Though
(答案→)D. However
解析：考察副词辨析。A因此；B而且；C否则，要不然；D然而；句意：过程很顺利，然而，我们很不自信会不会准时完成。根据句意说明D正确。