______ difficult it is, he is determined to ______ the experiment.
A．No matter how; have a go atB．However; have a go for
C．Whatever ; have a goD．No matter what; have a go at
A
考查讓步狀語從句和固定短語。句意“無論有多么困難，他都決心嘗試做那個(gè)實(shí)驗(yàn)�！毙揎椥稳菰~應(yīng)該用how，排除C、D；have a go at“嘗試”。故選A。
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