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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(答案→)A. whoever
B. any one of them
C. those who
D. anyone
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。