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____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+一段时间+before/after/since句型中,before从句中的动作经过该段时间后才会实现;after从句中的动作完成后已经过去了一段时间;since从句中的动作完成后到现在已经有一段时间了。

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