There is still much to discuss. We shall return to the problem next time.A. howeverB. t

问题补充：

There is still much to discuss. We shall, , return to the problem next time.

A. however

B. therefore

C. besides

D. anyhow

答案：

A. however

(答案→)B. therefore

C. besides

D. anyhow

解析：考察副词词义辨析。A然而；B因此；C而且；D无论如何；句意：还有很多需要讨论的内容。因此，下车我们要回到这些问题的讨论上来。根据句意说明B正确。