D
词义辨析. A. 有用的;有益的 B. 无助的;没有用的 C. 有帮助的;有益的 D. 无用的;无效的.句意:请汤姆帮助是无用的,他总是最后来帮助别人.选D.
It is ____ asking Tom for help, for he is always the last to
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