问题描述：
He served in the army in ___when he was in ____A.1940's ;his twenties B.1940's ;the twenties C.the
He served in the army in ___when he was in ____
A.1940's ;his twenties
B.1940's ;the twenties
C.the 1940's ;his twenties
D.the 1940's ;the twenties
He served in the army in ___when he was in ____
A.1940's ;his twenties
B.1940's ;the twenties
C.the 1940's ;his twenties
D.the 1940's ;the twenties
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