关于allow doing和allow to People are not allowed _ freely at the meeting and they don't allow _ either.A.to talk;smoking B.to talk;to smoke C.talking;smoking D.talking;to smoke 顺便请讲下后面一个空为什么这么选

allow to do和 allow doing区别 关于allow doing的用法 allow doing allow sb.to do和 allow sb.doing 的区别 allow的用法allow to do sth 和allow doing sth 有什么区别?谢谢了 allow allow allow allow doing sth allow doing 造句 allow doing 的造句 allow doing的意思 allow doing的造句 allow doing allow to do区别 Allow sb to do 和be allowed todo allow doing 造句 allow to do 和 allow doing sth到底该怎么区别? allow sb.to do sth.和allow doing sth.有什么不同?应该什么时候用哪个? allow to do something 和allow doing something 有什么区别急用!