He knows it's almost impossible to finish the task he but he wants to have a try .A. oth

问题补充：

He knows its almost impossible to finish the ,task he but he wants to have a try .

A. otherwise

B. anyhow

C. therefore

D. though

答案：

A. otherwise

(答案→)B. anyhow

C. therefore

D. though

解析：A. otherwise否则，B. anyhow不管怎样，C. therefore因此，D. though虽然，句意：他知道是不可能完成任务的，但是不管怎样，他还是要试一试。所以选B。