请教:---How_____do they travel every day?---About 100 kilometers.A.far B.long C.much D.often

A

A

A far

A

A far
how far是针对距离（多远）提问的．
how long是针对时间提问的．
How long have you been here?你到这儿多久了？
how much（修饰不可数名词）是针对数量提问的.
How much money do you have?
how often是针对频率提问的．
Hom often do you go home ?你多久回一次家？