He joined the army ( )the spring of 2009填in还是on?好象是in,但是具体时间of 2009的前,面不得用on吗

he joined the army last year John joined the army two years ago等于___two years since he joined the army He is a ____ .He joined the army last year. he joined the army last year 改成现在完成时 he joined the army last year 改成现在完成时 It is said _______ he has joined the army. joined the army什么意思? It is three years since he joined the army.为什么是用joined而不是用have joined He ________ the army for ten years.A.has joined B.has joined in C.joined D.has been in 同型转换 he joined the army two years ago.he(同型转换 he joined the army two years ago.he( ) ( ) ( )the army for two years.it is( )( )since he( )the army 同义句型转换（英语） He joined the army ten years ago.He joined the army ten years ago.①___ ___ ten years ago ___ he joined the army.②___ ___ ten years ___ he joined the army.③He ___ ___ in the army for ten years.④Ten years ___ ___ He ( ) the army when he was eighteen years old.A.took part in B.joined C.attended D.joined in It was three years ago that he joined the army与It is three years since he joined the army翻译及区 he joined the army last year.变为含现在完成时的句子→→It __ __ a year __ he joined the army.空里填什么 He ____the Army by the end of 1989.He _____in the army since then.A has joined,has beenB had joined,has beenhad he joined the army in 2009.改写同义句 he( )( ) a soldier ( )three years. he ___for three years.A has joined the army B has been in the army 为什么选B 为什么用since?my bother studied at the high school since he joined the army