_______ difficult the task may be, we must finish it on time, because we can’t meet such a precious opportunity _______ we have expected
A.Whatever; that
B.However; as
C.However; that
D.Whatever; which
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B解析考查让步状语从句和定语从句。difficult是形容词，应该用副词修饰，排除A、D；such...as是固定搭配。故选B