13. --- How long has he been in the army?--- Oh he joined the army as far as 1997. A. ag

问题补充：

13. --- How long has he been in the army?

--- Oh, he joined the army as far as 1997.

A. ago

B. away

C. from

D. Back

答案：

A. ago

B. away

C. from

(答案→)D. Back

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