several million 后边啥时候加of :many能修饰million吗?

several million 后边啥时候加of :many能修饰million吗? several million people这个, 是several millions of the students还是several million of the students还是several million of ... several million people还是several millions of people问什么 具体是several millions of students还是several million students 关于several million,many million_____ people in the world are using the Internet today.A several million B many million 书上说 million钱有several,many 修饰时 用单数,证明有many million 的把,不是表示好几百万吗? several millions of 还是several million具体是several millions of students还是several million of students several million of可以用吗?这么用对吗? 有several millions 有several thousands million,dozen,hundred,具体怎么用的啊? several 的用法several与hundred,thousand,million在一起怎样使用啊,hundred,thousand,million 是用单数还是复数?如果hundred,thousand,million后有名词呢? ____the students in the world are sending information by MSN every day .A many millions B several millions C several million D several million of ___people in the world are sending information by email every day答案是several million 为什么不是many million hundred, thousand, million等词前面与具体数字/several和不具体数字修饰时的不同情况.hundred, thousand, million等词前面有具体数字或several修饰时,不加-s,不与of 连接,如是many等不具体数字就加-s,与of 连 several million of 和several millions of做题目的时候无意中看到,然后有点不明白,是several million of 还是several millions of,另外一个的用法是什么,或者说另外一个有什么搭配吗、、 several million要不要加S?several是具体数字吗?若用它来修饰数词,如million,要不要加S啊? ____________ people in the world are sending information by E-mail every day.A.Several million B.Many millions C.Several millions D.Many million ______ people in the world are sending information by e-mail every day.A.Several million B.Many millions C.Several millions D.Many million million