______ difficult it is, he is determined to ______ the experiment.A.No matter how; have a go atB.However; have a go forC.Whatever ; have a goD.No matter what; have a go at
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A解析考查让步状语从句和固定短语。句意“无论有多么困难，他都决心尝试做那个实验。”修饰形容词应该用how，排除C、D；have a go at“尝试”。故选A。