____four years since I joined the army.A.There was B.There is C.It is D.It was 请问选哪个?
问题描述：
____four years since I joined the army.A.There was B.There is C.It is D.It was 请问选哪个?
答
____four years since I joined the army.A.There was B.There is C.It is D.It was
选C
【It's +时间+since+sb did sth】固定句型