Progress so far has been very good.We areconfident that the work will be completed on time

问题补充：

Progress so far has been very good.We areconfident that the work will be completed on time.

A. otherwise

B. therefore

C. however

D. somehow

答案：

A. otherwise

(答案→)B. therefore

C. however

D. somehow

解析：词义辨析,四个选项分别表示否则、因此，可是和莫名其妙的，根据题意选B，进程到目前非常顺利，我们因此非常自信……