difficulty we meet with, we must finish it on time, because the opportunity is valuableA

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A. Whatever; such
B. However; such
C. However; so
(答案→)D. Whatever, that
解析：此题前半句是让步状语从句， difficulty 为名词故用Whatever，因为 However 后跟形容词或副词。第二个空填that ，that 为副词，那么，用法相当于so。valuable 为形容词不能用 such修饰，因此答案选D。