They are determined to work out the task difficult it is.A. howeverB. no matter whatC. no

问题补充：

They are determined to work out the task,difficult it is.

A. however

B. no matter what

C. no matter what

D. whatever

答案：

(答案→)A. however

B. no matter what

C. no matter what

D. whatever

解析：考查连词词义辨析。However=no matter how+adj./adv.