difficult and challenging the task may be, we must finish it on time, because there is a possibility we’ll be fired if we can’t fulfill the task on time．
A. Whatever; that
B. However; that
C. Whatever; which
D. However; as
网友回答
A. Whatever; that
(答案→)B. However; that
C. Whatever; which
D. However; as
解析：考查Whatever和 However的用法和从句，However后跟形容词或副词；Whatever后跟名词。That引导的同位语从句，所以选B