摘要:2176] We sent letter thanks to had helped us. [译文] 我们写信感谢那些曾经帮助过我们的人. A. who B. whom C. whoever D. no matter who [答案及简析] A. 根据首选原则.答案应该在A, C中选择.但此句的意思是感谢那些已经帮助过我们的人.故只能选A.

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