问题补充：
单选题_______difficultywemeetwith,wemustfinishitontime,becausetheopportunityis_______valuable．A.Whatever; suchB.However; suchC.However; soD.Whatever, that
答案：
D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
