spare no efforts用单数还是复数?

spare no efforts用单数还是复数? spare no efforts 是spare no effort to do还是spare no efforts to do? spare no efforts什么意思 no people be用单数还是复数 no+名词,单数还是复数? 英语翻译不遗余力做什么事情的英语说法是spare no effort to do 还是 spare no efforts 一个英语词组的疑惑,是to spare no efforts to do还是to spare no effort to spare no effort 和 spare no efforts的区别 no students后面谓语用单数还是复数 No加名词谓语动词用单数还是复数形式? no one 作主语,谓语动词用单数还是复数