hard you try, it is difficult to lose weight without cutting down the amount you eat.A. Ho

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(答案→)A. However
B. Whatever
C. Whichever
D. Whenever
解析：本题考查的让步状语从句。句意：如果你不减少饮食的话，无论你多么努力尝试，也难减肥成功。此处的关键字眼是hard，hard既然被提到主语前，说明引导词应和hard一起来引导从句，而能够修饰hard的只有however一词，所以答案选A。另外，however还可用作连接性副词，表转折，“然而”之意。此处的however意为“无论多么”。