before join the army everyone has to have a m____ exam

How long before did he join the army?改错. How long before did he join the army?改错 Before you join the Army ,you will have to have a m（）examtion.首字母填空 before join the army everyone has to have a m____ exam 一般来讲是join the army 还是 join army 还是join an army It will be four years ( ) he can join the army .什么状语从句啊?用什么呢before,since,when,that My brother has ( )( )( )of the army for five years.原句是join the army five years ago. It is ten years since he ____(join) the army Jim isn't old e() to join the army.(军队) join in the army里的in为什么要去掉 My brother_（join）the Army lost year determined men shoud join the army这句英语是什么意思 Are you old enough to join the army? 是join the army（陆军）还是take part in army（陆军）? 有关状语从句It will be 4 years before he can join the army.为什么只能用before?用that 或when It's 10 years ago +that?那么when呢?又是怎样使用? serve in the army和join the army的区别比如serve in the army是完成时里的,只是状态.join the army是现在或将来的,表动作, 是join in army还是 join in a army? enter,join,take part in区别enter the army=join the army 为什么?enter a contest=take part in a contest 请问为什么？