There is still much to discuss； we shall return to this topic at the next meeting.A. yetB.

问题补充：

There is still much to discuss；，we shall return to this topic at the next meeting.

A. yet

B. therefore

C. otherwise

D. however

答案：

A. yet

(答案→)B. therefore

C. otherwise

D. however

解析：句意，此处应填表示“因此”、“所以”之意的词，故选therefore。