____four years since I joined the army.

A.There was     B.There is     C.It was     D.It is

D


解析:

在it +be+一段時間+before/after/since句型中,before從句中的動作經(jīng)過該段時間后才會實現(xiàn);after從句中的動作完成后已經(jīng)過去了一段時間;since從句中的動作完成后到現(xiàn)在已經(jīng)有一段時間了。

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