No jurisdiction so far has
tried using age verification methods like biometrics or government
identification to enforce a social mediaage cut-off, two of the methods being
trialed.这句话最后two of ......从语法结构是不是伴随状语?
At that time, a gallon of gasoline cost 18¢, which today would be close to $4——exactly where some experts think we might be headed.请问老师:此处的be headed 是be headed for吗?如果是为什么要省略for?where作什么成分?(等于for which吗?还是作名词?)