We will be for ______ promises to volunteer to help us solve the puzzling problem.
A.whoever
B.any one of them
C.those who
D.anyone
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A解析本题考查宾语从句。will be是动词，promises是动词，故此处应填连词，且做promises的主语，不可省略，由此可排除b 和d。选项c. those who为定语从句，先行词是those，promises要改为promise。