a为什么选择A，请给我原因。Each of the students likes to talk with the teacher.＝Every one of the students likes to talk with the teacher．（1）each可指两者或两者以上，every至少指三者(2)each 可做主语，宾语，表语，同位语和定语，every指可做定语（3）都可与单数名词搭配，但every后可接“基数词+复数名词”，表示“每.....”如：every three days（每3天）（4）都可做“每一个”解释，但every“总和”意义很重，each“个别”意义较重